Deuteronomy 33:8-11

8And of Levi he said, "Give to Levi your Thummim, and your Urim to your godly one, whom you tested at Massah, with whom you quarreled at the waters of Meribah;

9who said of his father and mother, 'I regard them not'; he disowned his brothers and ignored his children. For they observed your word and kept your covenant.

10They shall teach Jacob your rules and Israel your law; they shall put incense before you and whole burnt offerings on your altar.

11Bless, O Lord, his substance, and accept the work of his hands; crush the loins of his adversaries, of those who hate him, that they rise not again."