In this daf, we are zocheh to delve into the halachos of how a fast day is established and the parameters of its sanctity. The Gemara begins by discussing a "fast of hours" (ta'anis sha'os), analyzing whether a person who only fasts for a portion of the day, or who decides to fast mid-day, has fulfilled a meaningful act of fasting. We also learn about the essential requirement of kabbalas ta'anis—taking the fast upon oneself in advance—and the precise time during the previous day's Mincha when this acceptance must be made.
Additionally, the Gemara explores the boundaries of eating before a fast begins. The Chachamim discuss the exact cutoff time on the night before a communal fast, debating whether one may eat until dawn (alos hashachar) or only until the crow of the rooster, and how this halacha changes if a person has already finished their meal and slept.
הָא דְּאָמְרַתְּ מִתְעַנִּין לְשָׁעוֹת — וְהוּא שֶׁלֹּא טָעַם כְּלוּם עַד הָעֶרֶב.
As for that which you said, that one may fast for a few hours, this is only provided that he did not taste anything until the evening.
אָמַר לֵיהּ אַבָּיֵי: הָא תַּעֲנִית מְעַלַּיְיתָא הִיא!
Abaye said to him, to Rav Chisda: But this is a full-fledged fast, since he does not eat the entire day!
לָא צְרִיכָא — דְּאִימְּלַךְ אִימְּלוֹכֵי.
Rav Chisda answered: No, it is necessary to state this halacha in a case where he changed his mind; he did not intend to fast in the morning, but halfway through the day he decided to fast for the remaining hours.
וְאָמַר רַב חִסְדָּא: כׇּל תַּעֲנִית שֶׁלֹּא שָׁקְעָה עָלָיו חַמָּה — לָא שְׁמֵיהּ תַּעֲנִית.
And Rav Chisda said: Any fast upon which the sun does not set, meaning if one eats before nightfall, is not called a fast at all.
מֵיתִיבִי: אַנְשֵׁי מִשְׁמָר מִתְעַנִּין וְלֹא מַשְׁלִימִין!
The Gemara raises an objection from a Mishnah: The members of the priestly watch fast on communal fasts, but they do not complete the fast until nightfall! This implies that a partial-day fast is still called a fast.
הָתָם, לְצַעוֹרֵי נַפְשֵׁיהּ בְּעָלְמָא הוּא.
The Gemara answers: There, it is merely to cause themselves distress in solidarity with the community, but it is not a halachically complete fast.
תָּא שְׁמַע, דְּאָמַר רַבִּי אֶלְעָזָר בְּרַבִּי צָדוֹק: אֲנִי מִבְּנֵי בָנָיו שֶׁל סְנָאָה בֶּן בִּנְיָמִין, וּפַעַם אַחַת חָל תִּשְׁעָה בְּאָב לִהְיוֹת בְּשַׁבָּת, וּדְחִינוּהוּ לְאַחַר הַשַּׁבָּת, וְהִתְעַנִּינוּ בּוֹ וְלֹא הִשְׁלַמְנוּהוּ — מִפְּנֵי שֶׁיוֹם טוֹב שֶׁלָּנוּ הוּא.
Come and hear a proof, as Rabbi Elazar the son of Rabbi Tzadok said: I am of the descendants of Senaah the son of Binyamin, and once the Ninth of Av occurred on Shabbos, and we postponed it until after Shabbos, and we fasted on it but we did not complete it, because it was our Yom Tov, a family holiday on the tenth of Av.
הָתָם נָמֵי, לְצַעוֹרֵי נַפְשֵׁיהּ בְּעָלְמָא הוּא.
The Gemara rejects this: There too, it was merely to cause themselves distress, not a formal fast.
תָּא שְׁמַע, דְּאָמַר רַבִּי יוֹחָנָן: אֱהֵא בְּתַעֲנִית עַד שֶׁאָבוֹא לְבֵיתִי.
Come and hear another proof, as Rabbi Yochanan said: I shall be in a fast until I come to my house, which shows one can fast for just a few hours.
הָתָם, לְשַׁמּוֹטֵי נַפְשֵׁיהּ מִבֵּי נְשִׂיאָה הוּא דַּעֲבַד.
The Gemara answers: There, he did it only to excuse himself from the house of the Nasi, so they would not pressure him to eat, but it was not a real fast.
אָמַר שְׁמוּאֵל: כׇּל תַּעֲנִית שֶׁלֹּא קִיבֵּל עָלָיו מִבְּעוֹד יוֹם — לָאו שְׁמֵיהּ תַּעֲנִית.
Shmuel said: Any fast that one did not accept upon himself while it was still day on the preceding afternoon is not called a fast.
וְאִי יָתֵיב, מַאי?
The Gemara asks: And if he sat and fasted anyway without accepting it beforehand, what is he considered?
אָמַר רַבָּה בַּר שֵׁילָא: דָּמֵי לְמַפּוּחָא דְּמַלְיָא זִיקָא.
Rabba bar Sheila said: He is likened to a bellows that is full of air, which has no substance; his fasting has no halachic value.
אֵימַת מְקַבֵּיל לֵיהּ?
The Gemara asks: When does one accept it upon himself?
רַב אָמַר: בְּמִנְחָה, וּשְׁמוּאֵל אָמַר: בִּתְפִלַּת הַמִּנְחָה.
Rav said: During the time of Minchah, from midday onwards. And Shmuel said: During the Minchah prayer itself.
אָמַר רַב יוֹסֵף: כְּווֹתֵיהּ דִּשְׁמוּאֵל מִסְתַּבְּרָא, דִּכְתִיב בִּמְגִילַּת תַּעֲנִית: לָהֵן, כֹּל אִינִישׁ דְּיֵיתֵי עֲלוֹהִי מִקַּדְמַת דְּנָא — יֵיסַר.
Rav Yosef said: It stands to reason that the halacha is like Shmuel, as it is written in Megillat Taanit: Therefore, any person upon whom a fast comes from before this, he shall bind himself.
מַאי לָאו — יֵיסַר עַצְמוֹ בִּצְלוֹ?
Is it not that this means he shall bind himself in his prayer, which supports Shmuel?
לָא — יֵאסַר עַצְמוֹ.
The Gemara answers: No, the word should be read as he shall render himself prohibited from eating on those festive days.
פְּלִיגִי בַּהּ רַבִּי חִיָּיא וְרַבִּי שִׁמְעוֹן בְּרַבִּי.
The Gemara notes: Rabbi Chiyya and Rabbi Shimon the son of Rabbi Yehuda HaNasi disagree about this reading.
חַד אָמַר: יֵיסַר, וְחַד אָמַר: יֵאָסֵר.
One said the text reads 'yeisar', and one said it reads 'ye'aser'.
מַאן דְּאָמְרַתְּ יֵיסַר — כִּדְאָמְרִינַן. לְמַאן דְּאָמַר יֵאָסֵר — מַאי הִיא?
The one who said 'yeisar' is explained as we just said. But according to the one who said 'ye'aser', what is the meaning of this ruling?
דְּתַנְיָא בִּמְגִילַּת תַּעֲנִית: כׇּל אִינִישׁ דְּיֵיתֵי עֲלוֹהִי מִקַּדְמַת דְּנָא יֵאָסֵר. כֵּיצַד? יָחִיד שֶׁקִּיבֵּל עָלָיו שֵׁנִי וַחֲמִישִׁי וְשֵׁנִי שֶׁל כׇּל הַשָּׁנָה כּוּלָּהּ, וְאֵירְעוּ בָּם יָמִים טוֹבִים הַכְּתוּבִין בִּמְגִילַּת תַּעֲנִית, אִם נִדְרוֹ קוֹדֶם לִגְזֵרָתֵנוּ — יְבַטֵּיל נִדְרוֹ אֶת גְּזֵרָתֵנוּ, וְאִם גְּזֵרָתֵנוּ קוֹדֶמֶת לְנִדְרוֹ — תְּבַטֵּל גְּזֵרָתֵנוּ אֶת נִדְרוֹ.
As it is taught in Megillat Taanit: Any person upon whom a fast comes from before this, he shall be prohibited from eating. How so? An individual who accepted upon himself to fast on Mondays and Thursdays and Mondays of the entire year, and holidays written in Megillat Taanit occurred on them; if his vow preceded our decree, his vow annuls our decree and he must fast, but if our decree preceded his vow, our decree annuls his vow and he may not fast.
תָּנוּ רַבָּנַן: עַד מָתַי אוֹכֵל וְשׁוֹתֶה — עַד שֶׁיַּעֲלֶה עַמּוּד הַשַּׁחַר, דִּבְרֵי רַבִּי. רַבִּי אֶלְעָזָר בְּרַבִּי שִׁמְעוֹן אוֹמֵר: עַד קְרוֹת הַגֶּבֶר.
The Rabbis taught in a baraisa: Until when may one eat and drink on the night before a fast? Until dawn rises; these are the words of Rabbi. Rabbi Elazar the son of Rabbi Shimon says: Until the call of the rooster, which is earlier.
אָמַר אַבָּיֵי: לֹא שָׁנוּ אֶלָּא שֶׁלֹּא גָּמַר סְעוּדָתוֹ, אֲבָל גָּמַר סְעוּדָתוֹ — אֵינוֹ אוֹכֵל.
Abaye said: They only taught this where he had not finished his meal, but if he finished his meal, he may not eat any further.
אֵיתִיבֵיהּ רָבָא: גָּמַר וְעָמַד — הֲרֵי זֶה אוֹכֵל!
Rava raised an objection to him from a baraisa: If he finished his meal and stood up, he may still eat!
הָתָם כְּשֶׁלֹּא סִילֵּק.
Abaye answered: There it is a case where he had not yet cleared the table, so the meal is not considered fully finished.
אִיכָּא דְּאָמְרִי, אָמַר רָבָא: לֹא שָׁנוּ אֶלָּא כְּשֶׁלֹּא יָשַׁן, אֲבָל יָשַׁן — אֵינוֹ אוֹכֵל.
Some say a different version: Rava said: They only taught this where he did not sleep, but if he slept, he may not eat.
אֵיתִיבֵיהּ אַבָּיֵי: יָשַׁן וְעָמַד — הֲרֵי זֶה אוֹכֵל!
Abaye raised an objection to him: If he slept and arose, he may still eat!
הָתָם בְּמִתְנַמְנֵם.
Rava answered: There it refers to one who was merely dozing.
הֵיכִי דָּמֵי מִתְנַמְנֵם?
The Gemara asks: What are the circumstances of dozing?
אָמַר רַב אָשֵׁי: נִים וְלָא נִים, תִּיר וְלָא תִּיר. דְּקָרוּ לֵיהּ וְעָנֵי, וְלָא יָדַע אַהְדּוֹרֵי סְבָרָא, וְכִי מַדְכְּרִי לֵיהּ מִדְּכַר.
Rav Ashi said: He is asleep but not asleep, awake but not awake. If they call him he answers, but he does not know how to give a reasoned reply, and when they remind him of something, he remembers.
אָמַר רַב כָּהֲנָא אָמַר רַב: יָחִיד שֶׁקִּיבֵּל עָלָיו תַּעֲנִית — אָסוּר בִּנְעִילַת הַסַּנְדָּל. חָיְישִׁינַן שֶׁמָּא תַּעֲנִית צִבּוּר קִיבֵּל עָלָיו.
Rav Kahana said in the name of Rav: An individual who accepted upon himself a fast is forbidden in the wearing of shoes. We concern ourselves lest he accepted upon himself a public fast, which has stricter rules.
הֵיכִי לֶיעְבַּד?
The Gemara asks: What should he do to avoid this restriction?
אָמַר רַבָּה בַּר רַב שֵׁילָא, לֵימָא הָכִי: לְמָחָר אֱהֵא לְפָנֶיךָ בְּתַעֲנִית יָחִיד.
Rabba bar Rav Sheila said: Let him say this when accepting the fast: 'Tomorrow I shall be before You in an individual fast.'
אֲמַרוּ לֵיהּ רַבָּנַן לְרַב שֵׁשֶׁת: הָא קָא חָזֵינַן רַבָּנַן דִּמְסַיְּימִי מְסָנַיְיהוּ וְאָתוּ לְבֵי תַעֲנִיתָא!
The Rabbis said to Rav Sheshet: But we see Rabbis who wear their shoes and come to the house of the fast!
אִיקְּפַד וַאֲמַר לְהוּ: דִּלְמָא מֵיכַל נָמֵי אֲכוּל.
He became angry and said to them: Perhaps they also ate, meaning they do not hold of these restrictions at all!
אַבָּיֵי וְרָבָא (מְעַיְּילִי כִּי מְ)סָיְימִי אֲפַנְתָּא.
The Gemara relates: Abaye and Rava would wear soft leather slippers on a fast day.
מָרִימָר וּמַר זוּטְרָא מְחַלְּפִי דְּיַמִּינָא לִשְׂמָאלָא וְדִשְׂמָאלָא לְיַמִּינָא.
Marimar and Mar Zutra would switch their shoes, putting the right shoe on the left foot and the left shoe on the right foot, to feel discomfort.
רַבָּנַן דְּבֵי רַב אָשֵׁי נָפְקִי כִּי אוֹרְחַיְיהוּ, סָבְרִי כִּי הָא דְּאָמַר שְׁמוּאֵל: אֵין תַּעֲנִית צִבּוּר בְּבָבֶל אֶלָּא תִּשְׁעָה בְּאָב בִּלְבַד.
The Rabbis of the house of Rav Ashi went out in their usual way with regular shoes; they held like that which Shmuel said: There is no public fast in Babylonia with all these restrictions except for the Ninth of Av alone.
אָמַר רַב יְהוּדָה אָמַר רַב: לֹוֶה אָדָם תַּעֲנִיתוֹ וּפוֹרֵעַ.
Rav Yehuda said in the name of Rav: A person may borrow his fast and repay it on another day if he needs to eat.
כִּי אַמְרִיתַהּ קַמֵּיהּ דִּשְׁמוּאֵל, אָמַר לִי: וְכִי נֶדֶר קַבֵּל עֲלֵיהּ, דְּלָא סַגִּי דְּלָא מְשַׁלֵּם? לְצַעוֹרֵי נַפְשֵׁיהּ קַבֵּיל עֲלֵיהּ. אִי מָצֵי — מְצַעַר נַפְשֵׁיהּ, אִי לָא מָצֵי — לָא מְצַעַר נַפְשֵׁיהּ.
Rav Yehuda said: When I said this before Shmuel, he said to me: Did he accept a vow upon himself, that it is not enough unless he pays it back? He accepted upon himself to distress himself; if he is able, he distresses himself, and if he is not able, he does not distress himself and does not need to repay it.
אִיכָּא דְּאָמְרִי, אָמַר רַב יְהוּדָה אָמַר רַב: לֹוֶה אָדָם תַּעֲנִיתוֹ וּפוֹרֵעַ. כִּי אַמְרִיתַהּ קַמֵּיהּ דִּשְׁמוּאֵל, אָמַר לִי: פְּשִׁיטָא! לֹא יְהֵא אֶלָּא נֶדֶר. נֶדֶר — מִי לָא מָצֵי בָּעֵי לְשַׁלּוֹמֵי וּמֵיזַל לִמְחַר וּלְיוֹמָא אַחֲרִינָא.
Some say a different version: Rav Yehuda said in the name of Rav: A person may borrow his fast and repay it. When I said this before Shmuel, he said to me: It is obvious! Even if it were nothing but a vow, can he not pay it back and go tomorrow or another day?
רַב יְהוֹשֻׁעַ בְּרֵיהּ דְּרַב אִידֵּי אִיקְּלַע לְבֵי רַב אַסִּי. עֲבַדוּ לֵיהּ עִגְלָא תִּילְתָּא, אֲמַרוּ לֵיהּ: לִיטְעוֹם מָר מִידֵּי. אֲמַר לְהוּ: בְּתַעֲנִיתָא יָתֵיבְנָא.
Rav Yehoshua the son of Rav Iddi happened to come to the house of Rav Assi. They prepared for him a third-born calf, and they said to him: Let the master taste something. He said to them: I am sitting in a fast.
אֲמַרוּ לֵיהּ: וְלוֹזֵיף מָר וְלִיפְרַע, לָא סָבַר מָר לְהָא דְּאָמַר רַב יְהוּדָה אָמַר רַב: לֹוֶה אָדָם תַּעֲנִיתוֹ וּפוֹרֵעַ?
They said to him: Let the master borrow his fast and repay it later. Does the master not hold of that which Rav Yehuda said in the name of Rav: A person may borrow his fast and repay it?
אֲמַר לְהוּ: תַּעֲנִית חֲלוֹם הוּא.
He said to them: It is a fast for a bad dream, which must be fasted on that very day.
וְאָמַר רַבָּה בַּר מַחְסֵיָא אָמַר רַב חָמָא בַּר גּוּרְיָא אָמַר רַב: יָפָה תַּעֲנִית לַחֲלוֹם כְּאֵשׁ לִנְעוֹרֶת.
For Rabba bar Machseya said in the name of Rav Chama bar Guryah in the name of Rav: A fast is as beneficial for a bad dream as fire is to flax.
אָמַר רַב חִסְדָּא: וּבוֹ בַּיּוֹם.
Rav Chisda said: And only if he fasts on that very day.
וְאָמַר רַב יוֹסֵף: וַאֲפִילּוּ בְּשַׁבָּת.
And Rav Yosef said: And even on Shabbos one may fast for a bad dream.
מַאי תַּקַּנְתֵּיהּ? לִיתֵּיב תַּעֲנִיתָא לְתַעֲנִיתָא.
What is his remedy for fasting on Shabbos? Let him sit in another fast on a weekday for having fasted on the fast of Shabbos.
עָבְרוּ אֵלּוּ וְלֹא נַעֲנוּ — בֵּית דִּין גּוֹזְרִין שָׁלֹשׁ תַּעֲנִיּוֹת אֲחֵרוֹת עַל הַצִּבּוּר. אוֹכְלִין וְשׁוֹתִין מִבְּעוֹד יוֹם, וַאֲסוּרִין בִּמְלָאכָה וּבִרְחִיצָה וּבְסִיכָה וּבִנְעִילַת הַסַּנְדָּל וּבְתַשְׁמִישׁ הַמִּטָּה, וְנוֹעֲלִין אֶת הַמֶּרְחֲצָאוֹת.
If these three fasts passed and they were not answered, the Beit Din decrees three other fasts upon the community. They may eat and drink only while it is still day on the eve of the fast, and they are forbidden in work, and in washing, and in anointing, and in wearing shoes, and in marital relations, and they lock the bathhouses.
עָבְרוּ אֵלּוּ וְלֹא נַעֲנוּ, בֵּית דִּין גּוֹזְרִין עֲלֵיהֶן עוֹד שֶׁבַע שֶׁהֵן שְׁלוֹשׁ עֶשְׂרֵה תַּעֲנִיּוֹת עַל הַצִּבּוּר.
If these passed and they were not answered, the Beit Din decrees upon them another seven, which are thirteen fasts in total upon the community.
הֲרֵי אֵלּוּ יְתֵרוֹת עַל הָרִאשׁוֹנוֹת, שֶׁבְּאֵלּוּ מַתְרִיעִין, וְנוֹעֲלִין אֶת הַחֲנוּיוֹת. בַּשֵּׁנִי מַטִּין עִם חֲשֵׁיכָה, וּבַחֲמִישִׁי מוּתָּרִין מִפְּנֵי כְּבוֹד הַשַּׁבָּת.
These last seven are more stringent than the first ones, for on these we sound the shofar, and we lock the shops. On Monday they open slightly at nightfall, and on Thursday they are permitted to open due to the honor of Shabbos.
עָבְרוּ אֵלּוּ וְלֹא נַעֲנוּ, מְמַעֲטִין בְּמַשָּׂא וּמַתָּן, בְּבִנְיָן וּבִנְטִיעָה, בְּאֵירוּסִין וּבְנִישּׂוּאִין, וּבִשְׁאֵילַת שָׁלוֹם בֵּין אָדָם לַחֲבֵירוֹ — כִּבְנֵי אָדָם הַנְּזוּפִין לַמָּקוֹם.
If these passed and they were not answered, we decrease business, building and planting, betrothals and marriages, and greeting one another, like people who are rebuked by the Omnipresent.
הַיְּחִידִים חוֹזְרִין וּמִתְעַנִּין עַד שֶׁיֵּצֵא נִיסָן. יָצָא נִיסָן וְיָרְדוּ גְּשָׁמִים — סִימַן קְלָלָה, שֶׁנֶּאֱמַר: ״הֲלוֹא קְצִיר חִטִּים הַיּוֹם וְגוֹ׳״.
The individuals return and fast until Nissan ends. If Nissan ended and rain fell, it is a sign of a curse, as it is said: 'Is it not wheat harvest today...'
בִּשְׁלָמָא כּוּלְּהוּ, אִית בְּהוּ תַּעֲנוּג: רְחִיצָה וְסִיכָה וְתַשְׁמִישׁ הַמִּטָּה, אֲבָל מְלָאכָה — צַעַר הוּא!
The Gemara asks: Granted all of them, there is pleasure in them: washing, anointing, and marital relations; but work is a pain, so why is it forbidden?
אָמַר רַב חִסְדָּא אָמַר רַב יִרְמְיָה בַּר אַבָּא, אָמַר קְרָא: ״קַדְּשׁוּ צוֹם קִרְאוּ עֲצָרָה אִסְפוּ זְקֵנִים״, כַּעֲצֶרֶת, מָה עֲצֶרֶת אָסוּר בַּעֲשִׂיַּית מְלָאכָה — אַף תַּעֲנִית אָסוּר בַּעֲשִׂיַּית מְלָאכָה.
Rav Chisda said in the name of Rav Yirmeyah bar Abba: The verse says: 'Sanctify a fast, call an assembly, gather the elders.' This compares a fast to an assembly; just as an assembly is forbidden in doing work, so too a fast is forbidden in doing work.
אִי, מָה עֲצֶרֶת מֵאוּרְתָּא — אַף תַּעֲנִית נָמֵי מֵאוּרְתָּא!
The Gemara asks: If so, just as an assembly begins from the evening, so too a fast should also forbid work from the evening!
אָמַר רַבִּי זֵירָא: לְדִידִי מִיפָּרְשָׁא לִי מִינֵּיהּ דְּרַבִּי יִרְמְיָה בַּר אַבָּא. אָמַר קְרָא: ״אִסְפוּ זְקֵנִים״, דּוּמְיָא דַּאֲסִיפַת זְקֵנִים, מָה אֲסִיפַת זְקֵנִים בַּיּוֹם — אַף צוֹם נָמֵי בַּיּוֹם.
Rabbi Zeira said: To me it was explained by Rabbi Yirmeyah bar Abba himself: The verse says: 'Gather the elders.' This compares the fast to the gathering of the elders; just as the gathering of the elders is by day, so too the fast's restrictions are by day.
וְאֵימָא מִטִּיהֲרָא?
The Gemara asks: But say it should only begin from midday when the elders gather?
אָמַר רַב שִׁישָׁא בְּרֵיהּ דְּרַב אִידי: מְסַיַּיע לֵיהּ לְרַב הוּנָא, דְּאָמַר: מִצַּפְרָא כִּינּוּפְיָא.
Rav Shisha the son of Rav Iddi said: This supports Rav Huna, who said: From the morning is the gathering, so the fast begins in the morning.
הֵיכִי עָבְדִי? אָמַר אַבָּיֵי: מִצַּפְרָא עַד פַּלְגָא דְיוֹמָא מְעַיְּינִינַן בְּמִילֵּי דְמָתָא. מִכָּאן וְאֵילָךְ, רִבְעָא דְיוֹמָא קָרֵינַן בְּסִפְרָא וְאַפְטַרְתָּא, מִכָּאן וְאֵילָךְ בָּעֵינַן רַחֲמֵי, שֶׁנֶּאֱמַר: ״וַיָּקוּמוּ עַל עׇמְדָם וַיִּקְרְאוּ בְּסֵפֶר תּוֹרַת ה׳ אֱלֹהֵיהֶם רְבִעִית הַיּוֹם וּרְבִעִית מִתְוַדִּים וּמִשְׁתַּחֲוִים לַה׳ אֱלֹהֵיהֶם״.
The Gemara asks: How do they do this? Abaye said: From the morning until midday we examine the matters of the city. From then on, a quarter of the day we read in the Torah and the Haftarah. From then on, we seek mercy, as it is said: 'And they stood up in their place and read in the book of the Torah of Hashem their G-d for a quarter of the day, and a quarter they confessed and prostrated themselves before Hashem their G-d.'
The sugya clarifies that for a fast to be halachically recognized, it must generally be accepted the afternoon before during Mincha, as Shmuel rules, and must continue until sunset. While certain groups, like the priestly watch (anshei mishmar) or the family of Rabbi Tzadok, did not complete their fasts, the Gemara explains this was merely to participate in the community's distress rather than a formal fast. Finally, the Gemara establishes that on a communal fast where eating is permitted the night before, one may eat until dawn, provided they did not go to sleep with the intention of finishing their meal.
The Gemara teaches us a profound lesson about the power of our thoughts and intentions. Shmuel says that a fast which a person did not accept upon himself the day before is not called a fast at all; rather, that person is compared to a bellows filled only with air. Without the conscious, holy intention of a kabbalah—a formal acceptance—the physical act of refraining from food is just empty wind. It lacks the soul of the avodah.
This is a powerful guide for our daily lives. How often do we go through our day performing mitzvos, helping others, or even holding back our anger, but we do it simply by default or because we were caught up in the moment? The Torah is teaching us that the difference between a hollow, empty action and a deeply spiritual, transformative act of avodah is the preparation of our mind. When we take a moment beforehand to consciously dedicate our actions to Hashem, we elevate a simple physical event into something eternal.
Before you perform any mitzva or act of chesed today, pause for three seconds to consciously think: "I am doing this now to bring nachas ruach to Hashem."