Then Yahweh spoke to Moses, saying,
Then you will know that I have sent this commandment to you, that My covenant may continue with Levi,” says Yahweh of hosts.
So you shall appoint Aaron and his sons that they may keep their priesthood, but the outsider who comes near shall be put to death.”
“Now, behold, I have taken the Levites from among the sons of Israel instead of every firstborn, the first offspring of the womb among the sons of Israel. So the Levites shall be Mine.