Numbers 3:10 DBY

⁸  And they shall keep all the utensils of the tent of meeting, and the charge of the children of Israel, to do the service of the tabernacle.

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

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;