And the LORD spoke unto Moses, saying,
And you shall appoint Aaron and his sons, and they shall wait on their priest's office: and the stranger that comes near shall be put to death.
And I, behold, I have taken the Levites from among the children of Israel instead of all the firstborn that opens the womb among the children of Israel: therefore the Levites shall be mine;
And you shall know that I have sent this commandment unto you, that my covenant might be with Levi, says the LORD of hosts.