Deuteronomy 33:8-10

MLV(i) 8 And of Levi he said, Your Thummim and your Urim are with your holy man, whom you proved at Massah, with whom you contended at the waters of Meribah, 9 who said of his father and of his mother, I have not seen him, neither did he acknowledge his brothers, nor knew he his own sons, for they have observed your word and keep your covenant. 10 They will teach Jacob your ordinances and Israel your law. They will put incense before you and whole burnt offering upon your altar.