Deuteronomy 10:8

10:8 At that time the LORD separated the tribe of Levi, to bear the ark of the covenant of the LORD, to stand before the LORD to minister unto him, and to bless in his name, unto this day.

Deuteronomy 33:29

33:29 Happy [art] thou, O Israel: who [is] like unto thee, O people saved by the LORD, the shield of thy help, and who [is] the sword of thy excellency! and thine enemies shall be found liars unto thee; and thou shalt tread upon their high places.