For I was hungry and you gave me something to eat, I was thirsty and you gave me something to drink, I was a stranger and you invited me in.  I needed clothes and you clothed me, I was sick and you looked after me, I was in prison and you came to visit me.

The King will reply, "I tell you the truth, whatever you did for one of the least of these brothers of mine, you did for me.

Matthew 25:35-36, 40