Numbers 3:10-13 And to Aaron and his sons shall you commit this that they observe their priesthood. But any alien who comes near shall be put to death.

CLV⁽ⁱ⁾ ¹⁰ And to Aaron and his sons shall you commit this that they observe their priesthood. But any alien who comes near shall be put to death. ¹¹ Yahweh spoke to Moses, saying. ¹² As for me, behold, I take the Levites from the midst of the sons of Israel instead of every firstborn male opening up the womb among the sons of Israel. So the Levites became Mine, ¹³ for every firstborn male is Mine. In the day I smote every firstborn male in the land of Egypt I sanctified for Myself every firstborn male in Israel from human unto beast. Mine shall they become:I am Yahweh.