Like the morning
(4) [The facts are that] you fast only for strife and debate and to smite with the fist of wickedness. Fasting as you do today will not cause your voice to be heard on high.
(5) Is such a fast as yours what I have chosen, a day for a man to humble himself with sorrow in his soul? [Is true fasting merely mechanical?] Is it only to bow down his head like a bulrush and to spread sackcloth and ashes under him [to indicate a condition of heart that he does not have]? Will you call this a fast and an acceptable day to the Lord?
(6) [Rather] is not this the fast that I have chosen: to loose the bonds of wickedness, to undo the bands of the yoke, to let the oppressed go free, and that you break every [enslaving] yoke? [Acts 8:23.]
(7) Is it not to divide your bread with the hungry and bring the homeless poor into your house--when you see the naked, that you cover him, and that you hide not yourself from [the needs of] your own flesh and blood?
(8) Then shall your light break forth like the morning, and your healing (your restoration and the power of a new life) shall spring forth speedily; your righteousness (your rightness, your justice, and your right relationship with God) shall go before you [conducting you to peace and prosperity], and the glory of the Lord shall be your rear guard. [Exod. 14:19, 20; Isa. 52:12.]
Isaiah 58:4-8 AMP