Numbers 3:10-12

Darby Translation

¹⁰ And Aaron and his sons shalt thou appoint that they may attend to their priest's office; and the stranger that cometh near shall be put to death.

¹¹ And Jehovah spoke to Moses, saying,

¹² And I, behold, I have taken the Levites from among the children of Israel instead of every firstborn that breaketh open the womb among the children of Israel, and the Levites shall be mine;