Thematic Bible: Spirit of, explained

Isn't this the fast that I have been choosing: to loose the bonds of injustice, and to untie the cords of the yoke, and to let the oppressed go free, and to break every yoke? Isn't it to share your bread with the hungry, and to bring the homeless poor into your house; when you see the naked, to cover him with clothing, and not to raise yourself up from your own flesh and blood?"