From the NIV:
"Is not this the kind of fasting I have chosen: to loose the chains of injustice and untie the cords of the yoke, to set the oppressed free and break every yoke? Is it not to share your food with the hungry and to provide the poor wanderer with shelter—when you see the naked, to clothe him, and not to turn away from your own flesh and blood?"
From the Message:
This is the kind of fast day I'm after: to break the chains of injustice, get rid of exploitation in the workplace, free the oppressed, cancel debts. What I'm interested in seeing you do is: sharing your food with the hungry, inviting the homeless poor into your homes, putting clothes on the shivering ill-clad, being available to your own families.