Deuteronomy 33:8-10

Of Levi he said, “Your Thummim and Your Urim belong to Your godly man [Aaron], Whom You tested and proved at Massah, With whom You contended at the waters of Meribah; [Num 20:1-13] Who said of his father and mother, ‘I did not consider them’; Nor did he acknowledge his brothers, Nor did he regard his own sons, For the priests observed Your word, And kept Your covenant. “The priests shall teach Your ordinances (judgments) to Jacob, And Your law to Israel. They shall put incense before You, And whole burnt offerings on Your altar.