Bible
Fasting in the Bible
Last updated: May 31, 2026
Written by Blake Boege
Fasting in the Bible refers to the voluntary reduction or complete avoidance of food for a defined period to focus on spiritual devotion. Across both testaments, fasting is depicted as a practice to humble oneself before God, express repentance, seek guidance during crises, and intensify prayer. In the Old Testament, fasting was mandated on the Day of Atonement and practiced during times of national grief. In the New Testament, Jesus fasted for forty days in the wilderness and taught His followers how to fast without public display. People search for this topic to study spiritual disciplines, seek guidance for personal fasts, and examine biblical prayer patterns.
Fasting in the Bible is voluntary abstention from food for spiritual purposes: humbling oneself before God, prayer, repentance, mourning, and seeking guidance. Both Old and New Testaments record fasts; Jesus himself fasted forty days and assumed that his followers would fast.
Quick Answer
Fasting in the Bible is the voluntary abstinence from food or drink for spiritual purposes, such as humbling oneself, focusing on intense prayer, repenting of sin, and seeking divine guidance.
Direct answer
Fasting in the Bible is voluntary abstention from food for spiritual purposes: humbling oneself before God, prayer, repentance, mourning, and seeking guidance. Jesus fasted forty days (Matthew 4:1-2) and taught his followers to fast privately, not for show (Matthew 6:16-18).
Fasting is not a religious lever for getting what we want. It is a way to put God first, lay down our hunger before him, and seek him in earnest. The biblical pattern is sincere fasting before God, never harm to oneself or display before others.
Examples
Repentance
Joel 2:12-13, Jonah 3:5-9, Nehemiah 9:1
Mourning
2 Samuel 12:16 (David), 2 Samuel 1:12 (David and his men)
Seeking God's guidance
Ezra 8:21-23, Acts 13:1-3
Intercession in danger
Esther 4:16 — 'if I perish, I perish'
Dedication
Daniel 9:3, Luke 2:37 (Anna)
Forty-day fasts
Moses (Exodus 34:28), Elijah (1 Kings 19:8), Jesus (Matthew 4:2)
How it works
The page surveys fasting across the Bible: what it is, why people did it, what Jesus and the apostles taught about it, and what it is not. References are KJV.
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.Matthew 6:16, KJV
What fasting is
Fasting in the Bible is voluntary abstention from food (and sometimes drink) for spiritual purposes. The Hebrew word tsom and the Greek nesteia both describe the same essential practice: not eating, intentionally, for a time, before God. Fasting is usually accompanied by prayer, mourning, repentance, or seeking God. The point is not the abstinence itself but the deeper attentiveness to God it enables.
Old Testament examples
The Old Testament records fasting in many contexts. Israel fasts on the Day of Atonement (Leviticus 16:29-31; 23:27-32). David fasts and weeps while his child is sick (2 Samuel 12:16). Nehemiah fasts when he hears of the broken walls of Jerusalem (Nehemiah 1:4). Daniel fasts and prays for the future of Israel (Daniel 9:3). Esther asks the Jews of Susa to fast for her three days before she risks her life with the king (Esther 4:16). Joel calls Israel to a national fast of repentance (Joel 2:12-15). The prophets warn against empty, performative fasts (Isaiah 58:3-7).
Jesus and the New Testament
Jesus fasts forty days and forty nights in the wilderness before his ministry begins (Matthew 4:1-2; Luke 4:1-2). He teaches his followers to fast privately, not for human applause (Matthew 6:16-18). When his disciples are challenged for not fasting like the Pharisees, Jesus responds that they will fast when the bridegroom is taken from them (Matthew 9:14-15). The early church fasts before sending out Paul and Barnabas (Acts 13:1-3) and before appointing elders (Acts 14:23).
What fasting is not
The prophets are clear that fasting is not a religious lever for getting what you want from God. Isaiah 58 rebukes Israel for fasting while continuing to exploit workers and ignore the poor; God says he wants the fast 'to loose the bands of wickedness' and 'to deal thy bread to the hungry.' Jesus condemns the showy fasting of the hypocrites (Matthew 6:16). Fasting without a humble heart, repentance, and mercy toward others is empty in the Bible.
Practical and pastoral notes
Christians today fast in many ways: skipping a meal, a day, a partial fast (no rich foods, as in Daniel 10), or longer fasts under pastoral guidance. The biblical pattern is sincere fasting before God, not legalistic fasting for show or extreme fasting for spiritual heroism.
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Frequently asked questions
Fasting is voluntary abstention from food (and sometimes drink) for spiritual purposes. Throughout the Bible, fasting accompanies prayer, repentance, mourning, and seeking God's direction or deliverance. It is consistently presented as a means of humbling oneself before God, not as a way to manipulate God or earn his favor.
Yes. Matthew 4:1-2 records that Jesus fasted forty days and forty nights in the wilderness before his temptation. He also instructs his disciples on how to fast in Matthew 6:16-18, contrasting their private fasting with the showy fasting of the hypocrites. He assumes his followers will fast, saying 'when ye fast' (not 'if ye fast').
Several reasons recur. To repent and humble themselves (Joel 2:12-13; Jonah 3:5-9; Nehemiah 9:1). To mourn (David fasting for his sick child, 2 Samuel 12:16). To seek God's guidance (Ezra 8:21-23). To prepare for major ministry (Jesus's wilderness fast, Matthew 4:1-2; the church at Antioch before sending out Paul and Barnabas, Acts 13:1-3). To intercede in danger (Esther 4:16). To dedicate themselves to God (Daniel 9:3; Anna in the temple, Luke 2:37).
Fasting is not commanded as a fixed law in the New Testament for Christians. Jesus does not legislate the frequency. However, he assumes that his followers will fast (Matthew 6:16-18), and the early church practiced fasting (Acts 13:1-3; 14:23). Many Christian traditions have established voluntary fasts (Lent, weekly fasts, Friday abstinence). The biblical pattern is sincere fasting before God, not legalistic fasting for show.
The Bible records fasts of varying lengths. The most common are partial day fasts and full day fasts. Three-day fasts appear (Esther 4:16). Daniel's 21-day partial fast involves abstaining from rich foods (Daniel 10:2-3). Moses, Elijah, and Jesus fast forty days each, but these are unusual and accompanied by special divine support. Most Christians today fast for a meal, a day, or a few days, not for weeks. Decisions about length should consider physical health and circumstances.
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