Matthew 6:16-18 - Moreover when ye fast, be not, as the hypocrites, of a sad countenance: for they disfigure their faces, that they may appear unto men to fast. Verily I say unto you, They have their reward.
Acts 14:23 - And when they had ordained them elders in every church, and had prayed with fasting, they commended them to the Lord, on whom they believed.
Joel 2:12 - Therefore also now, saith the LORD, turn ye even to me with all your heart, and with fasting, and with weeping, and with mourning:
Mark 9:29 - And he said unto them, This kind can come forth by nothing, but by prayer and fasting.
Joel 1:14 - Sanctify ye a fast, call a solemn assembly, gather the elders and all the inhabitants of the land into the house of the LORD your God, and cry unto the LORD,
Acts 13:3 - And when they had fasted and prayed, and laid their hands on them, they sent them away.
Esther 4:16 - Go, gather together all the Jews that are present in Shushan, and fast ye for me, and neither eat nor drink three days, night or day: I also and my maidens will fast likewise; and so will I go in unto the king, which is not according to the law: and if I perish, I perish.
Isaiah 58:1-14 - Cry aloud, spare not, lift up thy voice like a trumpet, and shew my people their transgression, and the house of Jacob their sins.
Ezra 8:21-23 - Then I proclaimed a fast there, at the river of Ahava, that we might afflict ourselves before our God, to seek of him a right way for us, and for our little ones, and for all our substance.
Isaiah 58:6 - Is not this the fast that I have chosen? to loose the bands of wickedness, to undo the heavy burdens, and to let the oppressed go free, and that ye break every yoke?
Acts 13:2 - As they ministered to the Lord, and fasted, the Holy Ghost said, Separate me Barnabas and Saul for the work whereunto I have called them.
Luke 2:37 - And she was a widow of about fourscore and four years, which departed not from the temple, but served God with fastings and prayers night and day.
1 Corinthians 7:5 - Defraud ye not one the other, except it be with consent for a time, that ye may give yourselves to fasting and prayer; and come together again, that Satan tempt you not for your incontinency.
Matthew 9:14-15 - Then came to him the disciples of John, saying, Why do we and the Pharisees fast oft, but thy disciples fast not?
Matthew 5:6 - Blessed are they which do hunger and thirst after righteousness: for they shall be filled.
Matthew 6:18 - That thou appear not unto men to fast, but unto thy Father which is in secret: and thy Father, which seeth in secret, shall reward thee openly.
Matthew 4:4 - But he answered and said, It is written, Man shall not live by bread alone, but by every word that proceedeth out of the mouth of God.
Matthew 17:20-22 - And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.
Nehemiah 1:4 - And it came to pass, when I heard these words, that I sat down and wept, and mourned certain days, and fasted, and prayed before the God of heaven,
Ezra 8:23 - So we fasted and besought our God for this: and he was intreated of us.
https://www.kingjamesbibleonline.org/Bible-Verses-About-Fasting-And-Prayer/