Numbers 3:9-11

King James Version

⁹ And thou shalt give the Levites unto Aaron and to his sons: they are wholly given unto him out of the children of Israel.

¹⁰ And thou shalt appoint Aaron and his sons, and they shall wait on their priest's office: and the stranger that cometh nigh shall be put to death.

¹¹ And the Lord spake unto Moses, saying,