Mattityahu 10:41-42

Orthodox Jewish Bible

⁴¹ The one who gives the Baruch Habah to a navi (prophet) in the name of a navi will receive the sachar (reward) of a navi, and the one who gives the Baruch Habah to a tzaddik (righteous man) in the name of a tzaddik will receive the sachar of a tzaddik.

⁴² And whoever in the name of a talmid [of Moshiach] gives only a cup of cold water to one of these little ones [the least of the talmidim of Moshiach], omein, I say to you, he will by no means lose his sachar.