Deuteronomy 33:21
And he provided the first part for himself, because there, in a portion of the lawgiver, was he seated; and he came with the heads of the people, he executed the justice of the LORD, and his judgments with Israel.
More from Deuteronomy 33
And this is the blessing, wherewith Moses the man of God blessed the children of Israel before his death.
And he said, The LORD came from Sinai, and rose up from Seir unto them; he shined forth from mount Paran, and he came with ten thousands of saints: from his right hand went a fiery law
Yea, he loved the people; all his saints are in thy hand: and they sat down at thy feet; every one shall receive of thy words.
Moses commanded us a law, even the inheritance of the congregation of Jacob.
And he was king in Jeshurun, when the heads of the people and the tribes of Israel were gathered together.