Numbers 3:10 in the World English Bible
You shall appoint Aaron and his sons, and they shall keep their priesthood, but the stranger who comes near shall be put to death.”
Context
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,