Is this the Fast that YOU choose?
(כט) וְהָיְתָ֥ה לָכֶ֖ם לְחֻקַּ֣ת עוֹלָ֑ם בַּחֹ֣דֶשׁ הַ֠שְּׁבִיעִי בֶּֽעָשׂ֨וֹר לַחֹ֜דֶשׁ תְּעַנּ֣וּ אֶת־נַפְשֹֽׁתֵיכֶ֗ם וְכָל־מְלָאכָה֙ לֹ֣א תַעֲשׂ֔וּ הָֽאֶזְרָ֔ח וְהַגֵּ֖ר הַגָּ֥ר בְּתוֹכְכֶֽם׃ (ל) כִּֽי־בַיּ֥וֹם הַזֶּ֛ה יְכַפֵּ֥ר עֲלֵיכֶ֖ם לְטַהֵ֣ר אֶתְכֶ֑ם מִכֹּל֙ חַטֹּ֣אתֵיכֶ֔ם לִפְנֵ֥י יְהוָ֖ה תִּטְהָֽרוּ׃ (לא) שַׁבַּ֨ת שַׁבָּת֥וֹן הִיא֙ לָכֶ֔ם וְעִנִּיתֶ֖ם אֶת־נַפְשֹׁתֵיכֶ֑ם חֻקַּ֖ת עוֹלָֽם׃

(29) And it shall be a statute for ever unto you: in the seventh month, on the tenth day of the month, ye shall afflict your souls, and shall do no manner of work, the home-born, or the stranger that sojourneth among you. (30) For on this day shall atonement be made for you, to cleanse you; from all your sins shall ye be clean before the LORD. (31) It is a sabbath of solemn rest unto you, and ye shall afflict your souls; it is a statute for ever.

(א) יום הכפורים אסור באכילה ובשתיה וברחיצה ובסיכה ובנעילת הסנדל ובתשמיש המטה. והמלך והכלה ירחצו את פניהם. והחיה תנעול את הסנדל, דברי רבי אליעזר, וחכמים אוסרין.

(1) On Yom Kippur, it is forbidden to eat, to drink, to wash, to anoint, and to wear leather shoes and to have sexual relations. The King and the bride may wash their faces, and the newly delivered mother may wear leather shoes: the words of Rabbi Eliezer; and the Sages prohibit this.

(טו) וַתֹּאמֶר אֶסְתֵּר לְהָשִׁיב אֶל מָרְדֳּכָי. (טז) לֵךְ כְּנוֹס אֶת כָּל הַיְּהוּדִים הַנִּמְצְאִים בְּשׁוּשָׁן וְצוּמוּ עָלַי וְאַל תֹּאכְלוּ וְאַל תִּשְׁתּוּ שְׁלֹשֶׁת יָמִים לַיְלָה וָיוֹם גַּם אֲנִי וְנַעֲרֹתַי אָצוּם כֵּן וּבְכֵן אָבוֹא אֶל הַמֶּלֶךְ אֲשֶׁר לֹא כַדָּת וְכַאֲשֶׁר אָבַדְתִּי אָבָדְתִּי.

(15) Then Esther told them to return an answer to Mordecai: (16) ’Go, gather together all the Jews that are present in Shushan, and fast for me. Neither eat nor drink three days, night or day. I also and my maidens will fast in the same way; and so will I go to the king, which is not according to the law; and if I perish, I perish.’

(ד) וַיָּסִ֙ירוּ֙ בְּנֵ֣י יִשְׂרָאֵ֔ל אֶת־הַבְּעָלִ֖ים וְאֶת־הָעַשְׁתָּרֹ֑ת וַיַּעַבְד֥וּ אֶת־יְהוָ֖ה לְבַדּֽוֹ׃ (פ) (ה) וַיֹּ֣אמֶר שְׁמוּאֵ֔ל קִבְצ֥וּ אֶת־כָּל־יִשְׂרָאֵ֖ל הַמִּצְפָּ֑תָה וְאֶתְפַּלֵּ֥ל בַּעַדְכֶ֖ם אֶל־יְהוָֽה׃ (ו) וַיִּקָּבְצ֣וּ הַ֠מִּצְפָּתָה וַיִּֽשְׁאֲבוּ־מַ֜יִם וַֽיִּשְׁפְּכ֣וּ ׀ לִפְנֵ֣י יְהוָ֗ה וַיָּצ֙וּמוּ֙ בַּיּ֣וֹם הַה֔וּא וַיֹּ֣אמְרוּ שָׁ֔ם חָטָ֖אנוּ לַיהוָ֑ה וַיִּשְׁפֹּ֧ט שְׁמוּאֵ֛ל אֶת־בְּנֵ֥י יִשְׂרָאֵ֖ל בַּמִּצְפָּֽה׃
(4) And the Israelites removed the Baalim and Ashtaroth and they served the LORD alone. (5) Samuel said, “Assemble all Israel at Mizpah, and I will pray to the LORD for you.” (6) They assembled at Mizpah, and they drew water and poured it out before the LORD; they fasted that day, and there they confessed that they had sinned against the LORD. And Samuel acted as chieftain of the Israelites at Mizpah.
(ד) וַיָּחֶל יוֹנָה לָבוֹא בָעִיר מַהֲלַךְ יוֹם אֶחָד וַיִּקְרָא וַיֹּאמַר עוֹד אַרְבָּעִים יוֹם וְנִינְוֵה נֶהְפָּכֶת. (ה) וַיַּאֲמִינוּ אַנְשֵׁי נִינְוֵה בֵּאלֹהִים וַיִּקְרְאוּ צוֹם וַיִּלְבְּשׁוּ שַׂקִּים מִגְּדוֹלָם וְעַד קְטַנָּם.

(4) Yonah began to enter into the city a day’s journey, and he proclaimed, and said: ‘Yet forty days, and Nineveh shall be overthrown.’ (5) And the people of Nineveh believed God; and they proclaimed a fast, and put on sackcloth, from the greatest of them even to the least of them.

(ד) הגיע שבעה עשר במרחשון ולא ירדו גשמים, התחילו היחידים מתענין שלש תעניות.אוכלין ושותין משחשכה, ומתרין במלאכה וברחיצה ובסיכה ובנעילת הסנדל ובתשמיש המטה. (ה) הגיע ראש חדש כסלו ולא ירדו גשמים, בית דין גוזרין שלש תעניות על הצבור.אוכלין ושותין משחשכה, ומתרין במלאכה וברחיצה ובסיכה ובנעילת הסנדל ובתשמיש המטה. (ו) עברו אלו ולא נענו בית דין גוזרין שלש תעניות אחרות על הצבור.אוכלין ושותין מבעוד יום , ואסורין במלאכה וברחיצה ובסיכה ובנעילת הסנדל ובתשמיש המטה, ונועלין את המרחצאות.עברו אלו ולא נענו, בית דין גוזרין (עליהם) עוד שבע, שהן שלש עשרה תעניות על הצבור.הרי אלו יתרות על הראשונות, שבאלו מתריעין ונועלין את החנויות....

(4) If the seventeenth of Mar-Cheshvan has come without the rain having yet descended, private individuals commence to keep three fast-days. On the night beforehand, they are allowed to eat and drink, and it is allowed [on the fast day itself] to work, to bathe, to anoint the body, to wear [leather] shoes, and to perform the marriage duty. (5) If the new moon of Kislev has arrived without the rain having yet descended, the Beth Din (law court) shall order three public fast days. On the night beforehand, we may eat and drink, and it is allowed [on the fast day itself] to work to bathe, to anoint the body, to wear [leather] shoes, and to perform the marriage duty. (6) If these [fasts] have passed and were not [favorably] answered, the Beth Din shall decree three more public fasts. On the night beforehand, we may eat and drink, but [on the fast day itself] it is prohibited to work, to bathe, anoint the body, wear [leather] shoes, and to perform the marriage duty. Additionally, we lock the bathhouses. If these [fasts] have passed and were not [favorably] answered, the Beth Din shall decree seven more fast days, which altogether make thirteen public fasts. These are more [strict] than the earlier [fast days], because [on these new fasts] we cry out (either with the Shofar or with the added prayer of Anenu), and we lock the shops....

Why fasting? What does fasting do to our bodies and minds? Does fasting bring us into contact with the Divine? Does it change our spiritual awareness?

הזקן שבהן אומר לפניהן דברי כבושין:

§ The mishna taught: The eldest of the community says to them statements of rebuke....

אחינו לא שק ותענית גורמים אלא תשובה ומעשים טובים גורמים שכן מצינו באנשי נינוה שלא נאמר בהם וירא האלהים את שקם ואת תעניתם אלא (יונה ג, י) וירא האלהים את מעשיהם כי שבו מדרכם הרעה

What does he say? Our brothers, it is not sackcloth and fasting that cause atonement for our sins. Rather, repentance and good deeds will cause our atonement. This is as we find with regard to the people of Nineveh, that it is not stated about them: And God saw their sackcloth and their fasting. Rather, the verse states: “And God saw their deeds, that they had turned from their evil way” (Jonah 3:10).

(א) קְרָ֤א בְגָרוֹן֙ אַל־תַּחְשֹׂ֔ךְ כַּשּׁוֹפָ֖ר הָרֵ֣ם קוֹלֶ֑ךָ וְהַגֵּ֤ד לְעַמִּי֙ פִּשְׁעָ֔ם וּלְבֵ֥ית יַעֲקֹ֖ב חַטֹּאתָֽם׃ (ב) וְאוֹתִ֗י י֥וֹם יוֹם֙ יִדְרֹשׁ֔וּן וְדַ֥עַת דְּרָכַ֖י יֶחְפָּצ֑וּן כְּג֞וֹי אֲשֶׁר־צְדָקָ֣ה עָשָׂ֗ה וּמִשְׁפַּ֤ט אֱלֹהָיו֙ לֹ֣א עָזָ֔ב יִשְׁאָל֙וּנִי֙ מִשְׁפְּטֵי־צֶ֔דֶק קִרְבַ֥ת אֱלֹהִ֖ים יֶחְפָּצֽוּן׃ (ג) לָ֤מָּה צַּ֙מְנוּ֙ וְלֹ֣א רָאִ֔יתָ עִנִּ֥ינוּ נַפְשֵׁ֖נוּ וְלֹ֣א תֵדָ֑ע הֵ֣ן בְּי֤וֹם צֹֽמְכֶם֙ תִּמְצְאוּ־חֵ֔פֶץ וְכָל־עַצְּבֵיכֶ֖ם תִּנְגֹּֽשׂוּ׃ (ד) הֵ֣ן לְרִ֤יב וּמַצָּה֙ תָּצ֔וּמוּ וּלְהַכּ֖וֹת בְּאֶגְרֹ֣ף רֶ֑שַׁע לֹא־תָצ֣וּמוּ כַיּ֔וֹם לְהַשְׁמִ֥יעַ בַּמָּר֖וֹם קוֹלְכֶֽם׃ (ה) הֲכָזֶ֗ה יִֽהְיֶה֙ צ֣וֹם אֶבְחָרֵ֔הוּ י֛וֹם עַנּ֥וֹת אָדָ֖ם נַפְשׁ֑וֹ הֲלָכֹ֨ף כְּאַגְמֹ֜ן רֹאשׁ֗וֹ וְשַׂ֤ק וָאֵ֙פֶר֙ יַצִּ֔יעַ הֲלָזֶה֙ תִּקְרָא־צ֔וֹם וְי֥וֹם רָצ֖וֹן לַיהוָֽה׃ (ו) הֲל֣וֹא זֶה֮ צ֣וֹם אֶבְחָרֵהוּ֒ פַּתֵּ֙חַ֙ חַרְצֻבּ֣וֹת רֶ֔שַׁע הַתֵּ֖ר אֲגֻדּ֣וֹת מוֹטָ֑ה וְשַׁלַּ֤ח רְצוּצִים֙ חָפְשִׁ֔ים וְכָל־מוֹטָ֖ה תְּנַתֵּֽקוּ׃ (ז) הֲל֨וֹא פָרֹ֤ס לָֽרָעֵב֙ לַחְמֶ֔ךָ וַעֲנִיִּ֥ים מְרוּדִ֖ים תָּ֣בִיא בָ֑יִת כִּֽי־תִרְאֶ֤ה עָרֹם֙ וְכִסִּית֔וֹ וּמִבְּשָׂרְךָ֖ לֹ֥א תִתְעַלָּֽם׃ (ח) אָ֣ז יִבָּקַ֤ע כַּשַּׁ֙חַר֙ אוֹרֶ֔ךָ וַאֲרֻכָתְךָ֖ מְהֵרָ֣ה תִצְמָ֑ח וְהָלַ֤ךְ לְפָנֶ֙יךָ֙ צִדְקֶ֔ךָ כְּב֥וֹד יְהוָ֖ה יַאַסְפֶֽךָ׃ (ט) אָ֤ז תִּקְרָא֙ וַיהוָ֣ה יַעֲנֶ֔ה תְּשַׁוַּ֖ע וְיֹאמַ֣ר הִנֵּ֑נִי אִם־תָּסִ֤יר מִתּֽוֹכְךָ֙ מוֹטָ֔ה שְׁלַ֥ח אֶצְבַּ֖ע וְדַבֶּר־אָֽוֶן׃ (י) וְתָפֵ֤ק לָֽרָעֵב֙ נַפְשֶׁ֔ךָ וְנֶ֥פֶשׁ נַעֲנָ֖ה תַּשְׂבִּ֑יעַ וְזָרַ֤ח בַּחֹ֙שֶׁךְ֙ אוֹרֶ֔ךָ וַאֲפֵלָתְךָ֖ כַּֽצָּהֳרָֽיִם׃

(1) Cry with full throat, without restraint; Raise your voice like a ram’s horn! Declare to My people their transgression, To the House of Jacob their sin. (2) To be sure, they seek Me daily, Eager to learn My ways. Like a nation that does what is right, That has not abandoned the laws of its God, They ask Me for the right way, They are eager for the nearness of God: (3) “Why, when we fasted, did You not see? When we starved our bodies, did You pay no heed?” Because on your fast day You see to your business And oppress all your laborers! (4) Because you fast in strife and contention, And you strike with a wicked fist! Your fasting today is not such As to make your voice heard on high. (5) Is such the fast I desire, A day for men to starve their bodies? Is it bowing the head like a bulrush And lying in sackcloth and ashes? Do you call that a fast, A day when the LORD is favorable? (6) No, this is the fast I desire: To unlock fetters of wickedness, And untie the cords of the yoke To let the oppressed go free; To break off every yoke. (7) It is to share your bread with the hungry, And to take the wretched poor into your home; When you see the naked, to clothe him, And not to ignore your own kin. (8) Then shall your light burst through like the dawn And your healing spring up quickly; Your Vindicator shall march before you, The Presence of the LORD shall be your rear guard. (9) Then, when you call, the LORD will answer; When you cry, He will say: Here I am. If you banish the yoke from your midst, The menacing hand, and evil speech, (10) And you offer your compassion to the hungry And satisfy the famished creature— Then shall your light shine in darkness, And your gloom shall be like noonday.

וַיֹּ֣אמֶר אֱלֹהִ֔ים נַֽעֲשֶׂ֥ה אָדָ֛ם בְּצַלְמֵ֖נוּ כִּדְמוּתֵ֑נוּ וְיִרְדּוּ֩ בִדְגַ֨ת הַיָּ֜ם וּבְע֣וֹף הַשָּׁמַ֗יִם וּבַבְּהֵמָה֙ וּבְכָל־הָאָ֔רֶץ וּבְכָל־הָרֶ֖מֶשׂ הָֽרֹמֵ֥שׂ עַל־הָאָֽרֶץ׃
And God said, “Let us make man in our image, after our likeness. They shall rule the fish of the sea, the birds of the sky, the cattle, the whole earth, and all the creeping things that creep on earth.”