God blesses those who come to the aid of the poor and rebukes those who turn away from them: "Give to him who begs from you, do not refuse him who would borrow from you"; "you received without pay, give without pay." It is by what they have done for the poor that Jesus Christ will recognize his chosen ones. When "the poor have the good news preached to them," it is the sign of Christ's presence.
Source: Catechism of the Catholic Church (Vatican.va)