What Biblical Fasting Actually Is
Fasting in the Bible is always linked to prayer and seeking God, never presented as a technique for spiritual merit. In Matthew 6:16-17, Jesus assumes his followers will fast -- not if you fast, but when you fast -- redirecting motivation from public performance to private devotion. The Hebrew word tsuwm means to cover the mouth, an act of voluntary self-denial that creates space for God. Isaiah 58:6 reveals the fast God truly chooses: not ritual abstinence but loosing the chains of injustice and freeing the oppressed. True biblical fasting always moves outward into love as well as inward into prayer.
Fasting in the Old Testament
Moses fasted forty days on Sinai while receiving the Law (Exodus 34:28). David fasted while interceding for his sick child (2 Samuel 12:16). Ezra proclaimed a fast before the dangerous journey from Babylon to Jerusalem, seeking God's protection (Ezra 8:21-23). Esther called the entire Jewish community to fast three days before she approached the king at the risk of her life (Esther 4:16). Joel 2:12 captures the heart of Old Testament fasting: Return to me with all your heart, with fasting and weeping and mourning -- a posture of wholehearted return to God.
Fasting in the New Testament
Jesus himself fasted forty days at the start of his ministry (Matthew 4:2). When asked why his disciples did not fast, Jesus pointed to the presence of the Bridegroom -- but promised that when he was taken away, they would fast (Mark 2:20). The early church fasted before major decisions: Acts 13:2-3 records fasting before commissioning Paul and Barnabas; Acts 14:23 before appointing elders. Paul lists fasting among his apostolic hardships in 2 Corinthians 11:27, suggesting it was a regular discipline.
How to Fast Well Today
Richard Foster in Celebration of Discipline calls fasting the queen of the spiritual disciplines, arguing it reveals what controls us more than any other practice. A practical approach begins with a single-meal fast, then builds to a full day. Medical conditions require consulting a doctor before fasting from food. Non-food fasts -- from social media, entertainment, or news -- can serve the same spiritual purpose. The key is to replace what is given up with prayer and Scripture. Dallas Willard observed that a person who fasts regularly will be a person who prays regularly, because fasting creates space in which prayer becomes both necessary and natural.