Numbers 3:10-13

LITV(i) 10 And you shall appoint Aaron and his sons, and they shall keep their priesthood. And the stranger who comes near shall be put to death. 11 And Jehovah spoke to Moses, saying, 12 And I, behold, I have taken the Levites from the midst of the sons of Israel in the place of every first-born opening a womb among the sons of Israel; and the Levites have become Mine. 13 For every first-born is Mine, from the day I struck every first-born in the land of Egypt, I have set apart to Myself every first-born in Israel, from men to animal. They are Mine. I am Jehovah.