“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” (Isaiah 58:6, esv)?
“And when you fast,” Jesus said, before teaching a few, practical pointers on the subject (Matthew 6:16). His first words raise a basic question, though: When should you fast? Every other Tuesday? When your friends do? When you feel bored? No, fasting isn’t a spiritual whimsy; it’s a spiritual discipline, and the Bible gives some clear outlines to the practice. According to Isaiah 58, you should fast . . .
When you are caught in a sinful pattern. God said, “Is not this the fast that I choose: to loose the bonds of wickedness” (Isaiah 58:6a)? When you are caught in a sinful pattern, fast. Authentic fasting gives God an open channel to show you how you’re held captive by bad behavior or even by good behavior that’s out of control. Fasting reveals and breaks sinful patterns.
“God offers water for our scorched souls.”
When you have a heavy burden. Back to Isaiah 58:6b: “Is not this the fast that I choose . . . to undo the straps of the yoke, to let the oppressed go free, and to break every yoke?” Do you have a heavy burden you have been carrying for a long time? Then fast. For example, skip lunch for a week. Give the time you would have spent eating to prayer. And let the gnawing in your stomach heighten your hunger for God.
When you are oppressed by the enemy. Consider again the fast “to let the oppressed go free” (58:6b). Many believers feel burdened for someone who’s not walking with God. Names may immediately flood your mind. Perhaps you’ve prayed consistently for them. Add fasting. You can fast and pray about the oppression, asking God to tear the veil of darkness with His light.
When you want to give to someone else. “Is [the fast] not to share your bread with the hungry and bring the homeless poor into your house; when you see the naked, to cover him, and not to hide yourself from your own flesh” (58:7)? When we share our bread, homes, clothes, and blankets—not the extra items we don’t need or want anymore, but the stuff we consider ours—that’s a form of fasting pleasing to God. Fasting teaches us how to be generous not only with the surplus God provides, but also with the principal God provides.
When you need an answer to prayer. “Then you shall call, and the Lord will answer; you shall cry, and he will say, ‘Here I am’” (58:9). Fasting not only clarifies our prayers, but it also opens our eyes and ears to see and hear God’s answers. When our hunger for God is elevated, the stuff keeping us from sensing His presence will be removed, and we will know that when He says, “Here I am,” He means it.
When you need direction. Here’s another outcome of fasting: “And the Lord will guide you continually” (58:11). Who doesn’t want God’s guidance? Yet how often do we actually demonstrate our desire by fasting and waiting attentively on God?
When you need to be spiritually restored. Through fasting, God restores us. “And the Lord will . . . satisfy your desire in scorched places and make your bones strong; and you shall be like a watered garden, like a spring of water, whose waters do not fail” (58:11). What a stark picture of what our lives look like. God offers water for our scorched souls.
When you need to be revived. As long as you’re alive, you are under renovation—you’re not finished, and God isn’t finished with you. However “ruined” you see your life today, God can rebuild and use you. “And your ancient ruins shall be rebuilt; you shall raise up the foundations of many generations; you shall be called the repairer of the breach, the restorer of streets to dwell in” (58:12). Your best days can still be ahead.
Lord God, when should I fast? Help me to hear Your answer to that question. How do You want me to apply what I am reading and learning? Fasting heightens my hunger for You. Through fasting, You refine me, restore me, and awaken me. Thank You for the ways the spiritual disciplines set us free. In Jesus’ name, amen.