Mattityahu (Mat) 10:40-42

“Whoever receives you is receiving me, and whoever receives me is receiving the One who sent me. Anyone who receives a prophet because he is a prophet will receive the reward a prophet gets, and anyone who receives a tzaddik because he is a tzaddik will receive the reward a tzaddik gets. Indeed, if someone gives just a cup of cold water to one of these little ones because he is my talmid — yes! — I tell you, he will certainly not lose his reward!”