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 rearguard.
 Then you shall call, and the Lord will answer;
   you shall cry for help, and he will say, Here I am. 
If you remove the yoke from among you,
   the pointing of the finger, the speaking of evil,
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.
Isaiah 58:6-10

When Jesus saw the crowds, he went up the mountain; and after he sat down, his disciples came to him. 2Then he began to speak, and taught them, saying:
‘Blessed are the poor in spirit, for theirs is the kingdom of heaven.
‘Blessed are those who mourn, for they will be comforted.
‘Blessed are the meek, for they will inherit the earth.
‘Blessed are those who hunger and thirst for righteousness, for they will be filled.
‘Blessed are the merciful, for they will receive mercy.
‘Blessed are the pure in heart, for they will see God.
‘Blessed are the peacemakers, for they will be called children of God.
Matthew 5:1-9