Deuteronomy 33:8-10

Moses said this about the tribe of Levi: “O LORD, you have given your Thummim and Urim—the sacred lots— to your faithful servants the Levites. You put them to the test at Massah and struggled with them at the waters of Meribah. 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.