Numbers 3:9-11

Young's Literal Translation

⁹ and thou hast given the Levites to Aaron and to his sons; they are surely given to him out of the sons of Israel.

¹⁰ `And Aaron and his sons thou dost appoint, and they have kept their priesthood, and the stranger who cometh near is put to death.'

¹¹ And Jehovah speaketh unto Moses, saying,