Fasting is not a diet.
It is not a religious performance or a way to twist God’s arm.
It is a deliberate act of hunger: setting aside physical appetite to pursue something more urgent.
NIV “Yet even now,” declares the LORD, “return to me with all your heart, with fasting and weeping and mourning.” (Joel 2:12)
Every fast recorded in Scripture has a purpose behind it.
The 21 verses below are organized by those purposes so you can see not just what the Bible says about fasting, but why people fasted and what happened when they did.
What Fasting Is and Is Not
Jesus said “when you fast” in Matthew 6:16, not “if you fast,” treating it as normal Christian practice.
What He corrected was the motive: fasting to be seen earns only human admiration.
Fasting directed toward God, done in secret, is rewarded by the Father who sees in secret.
Purpose 1: To Humble Yourself Before God
Fasting is one of the most physical demonstrations of dependence on God.
Verse 1: Matthew 6:16–18
ESV “And when you fast, do not look gloomy like the hypocrites, for they disfigure their faces that their fasting may be seen by others. Truly, I say to you, they have received their reward. But when you fast, anoint your head and wash your face, that your fasting may not be seen by others but by your Father who is in secret. And your Father who sees in secret will reward you.”
Genuine humility before God does not advertise itself.
Verse 2: Psalm 35:13
NIV “Yet when they were ill, I put on sackcloth and humbled myself with fasting.”
David fasted as an act of lowering himself before God on behalf of someone else.
Verse 3: Ezra 8:21
ESV “Then I proclaimed a fast there, at the river Ahava, that we might humble ourselves before our God, to seek from him a safe journey for us, our children, and all our goods.”
Ezra called a public fast before a dangerous journey, choosing humility over pride.
Purpose 2: To Return to God in Repentance
Fasting has always accompanied serious repentance.
Verse 4: Joel 2:12–13
NIV “Return to me with all your heart, with fasting and weeping and mourning. Rend your heart and not your garments. Return to the LORD your God, for he is gracious and compassionate, slow to anger and abounding in love.”
The fast God wanted was not a torn robe but a torn heart.
Verse 5: Daniel 9:3
NASB “So I gave my attention to the Lord God, to seek Him by prayer and supplications, with fasting, sackcloth, and ashes.”
Daniel fasted while confessing the sins of Israel.
Verse 6: Jonah 3:5
ESV “And the people of Nineveh believed God. They called for a fast and put on sackcloth, from the greatest of them to the least of them.”
An entire city fasted in repentance and God relented from the destruction He had announced.
Verse 7: Nehemiah 1:4
NIV “When I heard these things, I sat down and wept. For some days I mourned and fasted and prayed before the God of heaven.”
Nehemiah received news of Jerusalem’s destruction and fasted before he took any action.
Purpose 3: To Seek Direction and Breakthrough
Jesus pointed to prayer and fasting when the disciples failed to cast out a particular demon.
Verse 8: Mark 9:29
NASB “And He said to them, ‘This kind cannot come out by anything except prayer and fasting.'”
Some spiritual obstacles require more than regular prayer.
Verse 9: Acts 13:2–3
NIV “While they were worshiping the Lord and fasting, the Holy Spirit said, ‘Set apart for me Barnabas and Saul for the work to which I have called them.’ So after they had fasted and prayed, they placed their hands on them and sent them off.”
The early church’s greatest missionary movement was launched during a fast.
Verse 10: Acts 14:23
ESV “And when they had appointed elders for them in every church, with prayer and fasting they committed them to the Lord in whom they had believed.”
Leadership appointments in the early church were preceded by prayer and fasting.
Verse 11: Esther 4:16
NIV “Fast for me. Do not eat or drink for three days, night or day. I and my attendants will fast as you do. When this is done, I will go to the king, even though it is against the law.”
Esther called a fast before the most dangerous moment of her life.
Purpose 4: For Spiritual Preparation
The most significant events in Scripture were preceded by extended fasting.
Verse 12: Matthew 4:1–2
NASB “Then Jesus was led up by the Spirit into the wilderness to be tempted by the devil. And after fasting forty days and forty nights, He then became hungry.”
Jesus entered His public ministry through forty days of fasting.
Verse 13: Deuteronomy 9:9
NIV “When I went up on the mountain to receive the tablets of stone, the tablets of the covenant that the LORD had made with you, I stayed on the mountain forty days and forty nights; I ate no bread and drank no water.”
Moses received the Ten Commandments during an extended fast.
Verse 14: Isaiah 58:6
ESV “Is not this the fast that I choose: to loose the bonds of wickedness, to undo the straps of the yoke, to let the oppressed go free, and to break every yoke?”
God’s chosen fast produces outward action, not only inward discipline.
Purpose 5: To Intensify Prayer and Intercession
Fasting and prayer are consistently paired.
Verse 15: Ezra 8:23
NIV “So we fasted and petitioned our God about this, and he answered our prayer.”
The simplest fasting testimony in Scripture: they fasted, they prayed, God answered.
Verse 16: Luke 2:37
ESV “She did not depart from the temple, worshiping with fasting and prayer night and day.”
Anna the prophetess lived a life of fasting and prayer and was present when Jesus was brought to the temple.
Verse 17: 2 Chronicles 20:3
NASB “And Jehoshaphat was afraid and turned his attention to seek the LORD, and proclaimed a fast throughout all Judah.”
A king facing impossible odds called the whole nation to fast before God moved.
Verse 18: Psalm 109:24
NIV “My knees give way from fasting; my body is thin and gaunt.”
The Psalmist’s fasting was physically costly, which is part of what made it meaningful.
Purpose 6: The Reward and Result of True Fasting
God is not unmoved by genuine fasting.
Verse 19: Isaiah 58:8
ESV “Then shall your light break forth like the dawn, and your healing shall spring up speedily; your righteousness shall go before you; the glory of the LORD shall be your rear guard.”
The true fast Isaiah describes produces light, healing, righteousness, and God’s protection.
Verse 20: Matthew 6:18
NIV “So that it will not be obvious to others that you are fasting, but only to your Father, who is unseen; and your Father, who sees what is done in secret, will reward you.”
God rewards what is done for Him in secret.
Verse 21: Joel 2:25
NASB “Then I will compensate you for the years that the swarming locust has eaten, the creeping locust, the stripping locust, and the gnawing locust, My great army which I sent among you.”
God promised restoration to the people who returned to Him with fasting and genuine repentance.
How to Fast with Purpose
Know what you are fasting for before you begin.
Combine every fast with prayer and Scripture; hunger without prayer is just skipping meals.
Let every hunger signal redirect your attention toward God.
Fast from the heart, not for appearances.
Keep the fast between you and God unless there is reason to make it communal.
Questions About Biblical Fasting
Is fasting required for Christians?
Fasting is not explicitly commanded in the New Testament, but Jesus expected it, saying “when you fast” in Matthew 6:16. It is a spiritual discipline, not a salvation requirement, and is presented as a means of growth rather than a measure of standing with God.
How long should a fast be?
Scripture records fasts from one day to forty days. Most individual fasts were a day or part of a day. Length is less important than sincerity. A one-meal fast offered with genuine focus carries more weight than a week-long fast done for show.
Can I fast from something other than food?
Yes. While most biblical fasts involve abstaining from food, the principle behind fasting is removing something that consumes your attention in order to redirect it toward God. Fasting from social media, entertainment, or other habits can serve the same spiritual purpose when practiced with prayer and genuine seeking of God.
Does fasting move God to act?
God is not manipulated by fasting, but Scripture shows Him responding to those who fast with genuine humility. Ezra 8:23 records that they fasted, prayed, and God answered. Fasting changes the posture of the person praying, which changes the nature of the prayer.
Should I tell others I am fasting?
Jesus taught fasting to be done privately. However, communal fasting is also biblical, as in Esther 4:16 and Acts 13:2. Private fasts should remain private; corporate fasts called for a shared purpose are practiced openly. The key distinction is whether it is done for God or for observation.
What should I do if I break a fast early?
Bring it to God honestly. Fasting is not a contract; it is a posture of seeking. If you break it, resume seeking. The goal was never the fast itself but what it pointed toward: a deeper engagement with God than ordinary days allow.
A Prayer Before You Fast
Lord, I come to this fast not to impress You and not to impress anyone else.
I come because I want You more than I want what I am giving up.
Search my motive.
If there is pride here, remove it.
If there is performance here, strip it.
What I want is the thing fasting has always pointed toward: Your face, Your voice, Your nearness.
Reward what is done in secret.
Answer what is asked in humility.
And let this fast produce in me what I cannot manufacture through any other discipline.
Amen.
References
Whitney, D. S. (2014). Spiritual disciplines for the Christian life. NavPress.
Foster, R. J. (1988). Celebration of discipline: The path to spiritual growth. HarperSanFrancisco.
Piper, J. (2009). A hunger for God: Desiring God through fasting and prayer. Crossway.
GotQuestions.org. (n.d.). What does the Bible say about fasting?
Bible Study Tools. (n.d.). 40 Bible verses about fasting and scripture guidelines.
Crosswalk.com. (n.d.). What does the Bible say about fasting?
Christianity.com. (n.d.). Why and how should Christians fast?
(2025). 20 inspiring Bible verses on fasting for spiritual growth. Answered Faith Blog.
(2019). 9 Bible verses on fasting. So Very Blessed Blog.
(n.d.). Fasting for the sake of the Kingdom. Desiring God Blog.
iBelieve.com. (n.d.). Bible verses about fasting: How to fast according to Scripture.
