Deuteronomy 33:8

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,

Deuteronomy 33:8 In-Context

6 Let Reuben live and not die, and let not his men be few.
7 And this blessing is for Judah, and he said, Hear, LORD, the voice of Judah, and bring him unto his people; let his hands be sufficient for him, and be thou a help to him from his enemies.
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.
The Jubilee Bible (from the Scriptures of the Reformation), edited by Russell M. Stendal, Copyright © 2000, 2001, 2010