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?...
If you offer your food to the hungry
and satisfy the needs of the afflicted,
then your light shall rise in the darkness
and your gloom be like the noonday.
The Lord will guide you continually,
and satisfy your needs in parched places,
and make your bones strong;
and you shall be like a watered garden,
like a spring of water,
whose waters never fail.
Isaiah 58: 6-7, 10-11 (NRSV)