Fasting

Is such the fast that I choose, a day to humble oneself? Is it to bow down the head like a bulrush, and to lie in sackcloth and ashes? Will you call this a fast, a day acceptable to the Lord? Is not this the fast that I choose: to loose the bonds of injustice, to undo the thongs of the yoke, to let the oppressed go free, and to break every yoke? Is it not to share your bread with the hungry, and bring the homeless poor into your house; when you see the naked, to cover them, and not to hide yourself from your own kin? Then your light shall break forth like the dawn, and your healing shall spring up quickly your vindicator shall go before you, the glory of the Lord shall be your rear guard. Then you shall call, and the Lord will answer; you shall cry for help, and he will say, Here I Am.
Isaiah 58:5-9