Isaiah 58:6 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?
If you want a Biblical explanation of fasting, you need to read Isaiah 58. Fasting can be so misunderstood. It often turns into twisting God’s arm like a hunger strike. That was never what God wanted His people to think of in fasting.
Fasting was taking the time to cut away sin, the world, selfishness, and to focus on Him. It was about a change in life and actions. It is evident in this chapter what He wanted. Just read the following from the chapter and consider fasting.
Behold, in the day of your fast ye find pleasure, And exact all your labours.
ye fast for strife and debate, And to smite with the fist of wickedness:
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?
if thou draw out thy soul to the hungry, And satisfy the afflicted soul;
And shalt honour him, not doing thine own ways, Nor finding thine own pleasure, nor speaking thine own words: