The Bible says:

For I was an hungered, and you gave me meat: I was thirsty, and you gave me drink: I was a stranger, and you took me in: Naked, and you clothed me: I was sick, and you visited me: I was in prison, and you came to me. Then shall the righteous answer him, saying, Lord, when saw we you an hungered, and fed you? or thirsty, and gave you drink? When saw we you a stranger, and took you in? or naked, and clothed you? Or when saw we you sick, or in prison, and came to you? And the King shall answer and say to them, Truly I say to you, Inasmuch as you have done it to one of the least of these my brothers, you have done it to me. (Matthew 25:35–40)