Deuteronomy 33:9-11

The Levites obeyed your word and guarded your covenant. They were more loyal to you than to their own parents. They ignored their relatives and did not acknowledge their own children. They teach your regulations to Jacob; they give your instructions to Israel. They present incense before you and offer whole burnt offerings on the altar. Bless the ministry of the Levites, O LORD, and accept all the work of their hands. Hit their enemies where it hurts the most; strike down their foes so they never rise again.”