Deuteronomy 33:8-10

EJ2000(i) 8 ¶ And to Levi he said, Let thy Thummim and thy Urim be with thy holy one, whom thou didst prove at Massah and with whom thou didst strive at the waters of Meribah, 9 who said unto his father and to his mother, I have not seen them; neither did he acknowledge his brethren nor know his own children; therefore, they shall keep thy word and guard thy covenant. 10 They shall teach Jacob thy judgments and Israel thy law; they shall put incense before thy nostrils and a perfect sacrifice upon thine altar.