Is not this the fast that I have chosen? to loose the bonds of wickedness, to undo the heavy burdens, and to let the oppressed go free, and that you break every yoke? Is it not to share your bread with the hungry, and that you bring the poor that are cast out to your house? when you see the naked, that you cover him; and that you hide not yourself from your own flesh? Then shall your light break forth as the morning, and your health shall spring forth speedily: and your righteousness shall go before you; the glory of the LORD shall be your rear guard.
(Isaiah 58:6-8)