Leviticus 23:27

27Now aon the tenth day of this seventh month is the Day of Atonement. It shall be for you a time of holy convocation, and you shall afflict yourselves
Or  shall fast; also verse 32
and present a food offering to the Lord.

2 Chronicles 20:3

3Then Jehoshaphat was afraid and set his face cto seek the Lord, and dproclaimed a fast throughout all Judah.

Nehemiah 9:1

The People of Israel Confess Their Sin

1Now on the twenty-fourth day of ethis month the people of Israel were assembled fwith fasting gand in sackcloth, hand with earth on their heads.

Esther 4:16

16Go, gather all the Jews to be found in Susa, and hold a fast on my behalf, and do not eat or drink for ithree days, night or day. I and my young women will also fast as you do. Then I will go to the king, though it is against the law, jand if I perish, I perish.”

Isaiah 58:1-3

True and False Fasting

1 Cry aloud; do not hold back;
klift up your voice like a trumpet;
ldeclare to my people their transgression,
to the house of Jacob their sins.
2 mYet they seek me daily
and delight to know my ways,
as if they were a nation that did righteousness
and did not forsake the judgment of their God;
they ask of me righteous judgments;
they delight to draw near to God.
3 nWhy have we fasted, and you see it not?
Why have we humbled ourselves, and you take no knowledge of it?’
Behold, in the day of your fast you seek your own pleasure,
Or pursue your own business

pand oppress all your workers.

Joel 1:13

A Call to Repentance

13 qPut on sackcloth and lament, rO priests;
swail, O ministers of the altar.
Go in, tpass the night in sackcloth,
uO ministers of my God!
vBecause grain offering and drink offering
are withheld from the house of your God.

Joel 2:12-17

Return to the Lord

12 “Yet even now,” declares the Lord,
wreturn to me with all your heart,
xwith fasting, with weeping, and with mourning;
13and yrend your hearts and not zyour garments.”
Return to the Lord your God,
aafor he is gracious and merciful,
slow to anger, and abounding in steadfast love;
aband he relents over disaster.
14 acWho knows whether he will not turn and relent,
and adleave a blessing behind him,
aea grain offering and a drink offering
for the Lord your God?
15 afBlow the trumpet in Zion;
agconsecrate a fast;
call a solemn assembly;
16gather the people.
ahConsecrate the congregation;
assemble the elders;
aigather the children,
even nursing infants.
ajLet the bridegroom leave his room,
and the bride her chamber.
17 akBetween the alvestibule and the amaltar
anlet the priests, the ministers of the Lord, weep
and say, “Spare your people, O Lord,
and make not your heritage a reproach,
a byword among the nations.
Or  reproach, that the nations should rule over them

apWhy should they say among the peoples,
Where is their God?’”
Copyright information for ESV