Numbers 25

10 The Lord said to Moses, 11 "Because of what Phinehas has done, I am no longer angry with the people of Israel. He refused to tolerate the worship of any god but me, and that is why I did not destroy them in my anger. 12 So tell him that I am making a covenant with him that is valid for all time to come. 13 He and his descendants are permanently established as priests, because he did not tolerate any rivals to me and brought about forgiveness for the people’s sin."