What Does the Bible Say About fasting?
The Bible presents fasting as the voluntary abstinence from food, or other necessities, for a specific period to focus entirely on prayer, repentance, and seeking the presence of God. It is not a mechanism to manipulate God, but a spiritual discipline designed to humble the soul and realign one’s heart with the divine will.
In the Old Testament, the Hebrew word for fasting is tsuwm (Strong’s H6684), which literally signifies “to cover the mouth.” This implies a physical cessation of intake to facilitate a spiritual opening. You can explore the depths of this term through the Blue Letter Bible lexicon. Throughout the Law and the Prophets, fasting was often associated with national repentance (such as on the Day of Atonement) and moments of profound crisis where human effort had proven insufficient. It served as a visceral acknowledgment that “man shall not live by bread alone, but by every word that proceedeth out of the mouth of God” (Matthew 4:4, KJV).
In the New Testament, the Greek term nēsteuō (Strong’s G3522) continues this tradition but shifts the focus from ritualistic observance to internal sincerity. While the Pharisees used fasting as a public display of piety, Jesus taught that true fasting is an act of secret devotion between the believer and the Father. Modern Christians often treat fasting as a “spiritual diet” or a way to gain leverage in prayer, but the biblical witness insists that fasting is primarily about the hunger for God’s righteousness. Without the accompanying heart of obedience—as highlighted in Isaiah 58—fasting remains a hollow exercise. It is a tool for silencing the noise of the flesh so that the still, small voice of the Spirit can be heard with absolute clarity.
Most Powerful Bible Verses About fasting (KJV)
The three most powerful verses regarding fasting in the Bible are Matthew 6:17-18, Isaiah 58:6-7, and Joel 2:12. These passages establish the foundational requirements of internal motivation, social justice, and genuine repentance that must accompany the act of abstaining from food.
1. Matthew 6:17-18
“But thou, when thou fastest, anoint thine head, and wash thy face; That thou appear not unto men to fast, but unto thy Father which is in secret: and thy Father, which in secret shall see, shall reward thee.” (Matthew 6:17-18, KJV)
This instruction comes from the Sermon on the Mount, where Jesus addressed the hypocrisy of the religious elite. In the first-century Jewish context, Pharisees would disfigure their faces to broadcast their holiness, seeking the praise of men. By commanding his disciples to “anoint thine head and wash thy face,” Jesus was instructing them to maintain their normal daily appearance. The goal of fasting is not to look “spiritual” to others, but to foster an authentic, hidden communion with God.
The Greek word for “fastest” here is nēsteuō. Examining this word in Strong’s Concordance reveals that it denotes a voluntary abstinence. Jesus emphasizes the “secret” (Greek: kruptos) nature of this act. The theology here is profound: when you remove the desire for human validation, you create a vacuum that only the presence of God can fill. The “reward” promised is not necessarily a transactional blessing, but the reward of being seen and known by the Father.
In modern application, this verse serves as a litmus test for our motives. If we find ourselves announcing our fasts on social media or in casual conversation to garner sympathy or admiration, we have already received our reward in full. True fasting is a private crucible where we strip away our reliance on the temporal to feast upon the eternal. Before you begin a fast, ask yourself: “Would I still do this if no one on earth ever knew?”
2. Isaiah 58:6-7
“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? Is it not to deal thy bread to the hungry, and that thou bring the poor that are cast out to thy house? when thou seest the naked, that thou cover him; and that thou hide not thyself from thine own flesh?” (Isaiah 58:6-7, KJV)
The prophet Isaiah writes to a nation that was performing the rituals of fasting while simultaneously engaging in oppression and exploitation. The people were perplexed as to why God did not “see” their fasting. Isaiah clarifies that God rejects a fast that is merely ritualistic while the heart remains calloused toward the suffering of others. It is a stinging rebuke of religious compartmentalization—dividing “spiritual” acts from “moral” conduct.
The Hebrew word for “chosen” (Strong’s H977, bachar) implies a deliberate selection or a preferred object. God is essentially saying, “The fast I have selected as pleasing to Me is not just the absence of food, but the presence of justice.” The “yoke” (Strong’s H4133, motah) refers to the bars of a yoke used on oxen, symbolizing the heavy burdens of sin and social injustice. By using these terms, Isaiah connects the physical act of fasting to the spiritual work of liberation.
The spiritual lesson is clear: our vertical relationship with God cannot be separated from our horizontal relationship with our neighbor. If your fast makes you irritable, self-righteous, or dismissive of the hurting, you have missed the point. True fasting should soften our hearts, making us more sensitive to the needs of the broken. When we deny our own appetites, we should naturally become more aware of the plight of those who have no choice in their hunger.
3. 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.” (Joel 2:12, KJV)
Joel writes during a time of national catastrophe—a locust plague that devastated the land. The prophet calls for a radical, corporate return to God. This was not a routine religious exercise; it was a desperate, emergency response to judgment. The imagery of “weeping and mourning” suggests that fasting is the outward expression of an inward brokenness over sin and the current state of the nation.
The Hebrew term for “turn” is shuwb (Strong’s H7725), which is the primary biblical word for repentance. It denotes a physical turning around—a 180-degree change in direction. By linking shuwb with fasting, Joel teaches that fasting is the physical embodiment of repentance. It is the act of saying, “I am so serious about returning to You that I am willing to deny my most basic biological need to demonstrate my sincerity.”
This verse reminds us that fasting is often an appropriate response to seasons of spiritual dryness or corporate crisis. If you feel that your life has drifted from the center of God’s will, fasting is the “reset button.” It is an invitation to stop, weep over the distance between your life and God’s standards, and intentionally turn back to Him with your whole heart.
Key Takeaways: Bible Verses About fasting
| Verse Reference (KJV) | Core Spiritual Message | How to Apply Today |
|---|---|---|
| Matthew 6:17-18 | Fasting must be done for God’s eyes only, not for human applause. | Keep your fasting private; do not use it to appear holy. |
| Isaiah 58:6-7 | True fasting is accompanied by acts of justice and charity. | Use the time/resources saved by fasting to help the needy. |
| Joel 2:12 | Fasting is a physical expression of deep, heart-felt repentance. | Fast when you need to realign your heart with God’s will. |
How Can I Apply Bible Verses About fasting in My Daily Life?
When You Feel Overwhelmed at Work
When the pressure of your career feels like a “yoke” (Isaiah 58:6), use your lunch hour to fast from food and engage in “prayer-breaks.” Instead of scrolling through your phone, find a quiet place to read a Psalm. Ask God to loosen the “bands of wickedness” in your workplace—such as toxic gossip or unethical demands—and to give you the wisdom to navigate your responsibilities with integrity rather than anxiety.
When a Relationship Hurts
In moments of relational conflict, fasting can help you move from a place of defensiveness to a place of intercession. Dedicate a 24-hour period to fasting for the person who has hurt you. As your stomach growls, let that physical sensation trigger a prayer for God to “undo the heavy burdens” (Isaiah 58:6) in that person’s life. This shifts your focus from your own pain to the grace that God extends to both of you.
During Financial Hardship
When you are worried about money, the temptation is to cling tighter to what you have. Fasting teaches the opposite: total reliance on God’s providence. During a fast, replace your meal times with scripture study on God’s faithfulness (e.g., Matthew 6:33). Use the money you would have spent on food during that fast to bless someone else who is struggling, trusting that God will provide for your needs as you prioritize His kingdom.
A Prayer for fasting
Guided Scriptural Prayer
Heavenly Father, I come before You today with a humble heart, acknowledging that I am often distracted by the appetites of the flesh and the cares of this world. As I enter into this time of fasting, I ask that You would strip away the noise of my life and replace it with the stillness of Your presence. May this act of self-denial not be a ritual for others to see, but a secret sacrifice offered solely to You. I repent of my pride, my self-reliance, and the ways I have ignored the needs of those around me.
Lord, let this fast be a bridge back to Your heart. As I deny my physical hunger, satisfy my soul with Your righteousness. May I emerge from this time with clearer vision, a softer heart, and a deeper dependence on Your Word, which is my true bread. Grant me the strength to loose the bands of wickedness in my own life and to be an instrument of Your justice to the broken. In the name of Jesus Christ, my Savior and Provider, Amen.
Frequently Asked Questions About fasting in the Bible
Does the Bible say fasting is mandatory for every Christian?
The Bible does not explicitly command a specific frequency or schedule for fasting in the way it commands prayer or gathering for worship. However, Jesus assumes his followers will fast. In Matthew 9:15, He states that his disciples will fast “when the bridegroom shall be taken from them.” This implies that fasting is a natural response of the believer who longs for the return of Christ and the fullness of His kingdom. While not a legalistic requirement for salvation, it is presented as a normative, powerful discipline for those seeking to grow in spiritual maturity and intimacy with God.
Is it a sin to break a fast early?
Fasting is a voluntary act of devotion, not a legalistic vow that carries a penalty of sin if broken. If you have to break a fast due to health reasons, unexpected work demands, or genuine weakness, do not succumb to guilt or shame. God looks at the heart, not the clock. If you find yourself unable to complete a fast as planned, simply offer the time you did complete to the Lord and ask Him to help you maintain a heart of surrender, regardless of your physical intake.
How does God reward fasting according to Scripture?
The reward for fasting is primarily spiritual, not material. In Matthew 6:18, Jesus promises that the Father who sees in secret will “reward thee.” This reward is often manifested as increased spiritual discernment, a deeper sense of God’s presence, the breaking of stubborn strongholds, and the alignment of our desires with His will. While some biblical characters saw specific interventions after fasting (such as victory in battle or the reversal of judgment), the ultimate reward is the person of God Himself. To be heard and seen by Him is the greatest possible gain for the believer.
What is the difference between a “partial” and “total” fast?
The Bible records various types of fasting. A “total” fast—abstaining from both food and water—is seen in instances of extreme crisis, such as Esther’s three-day fast (Esther 4:16). However, this is rare and short-term. A “partial” fast is more common, such as the “Daniel Fast” (Daniel 10:3), where Daniel abstained from “pleasant bread,” meat, and wine. These distinctions are not about finding a “loophole” to make fasting easier, but about choosing a method that allows you to maintain your focus on prayer while being responsible with the body God has given you. The goal is always the same: to minimize the distraction of the flesh to prioritize the voice of the Spirit.