Numbers 3:10-13

CAB(i) 10 And you shall appoint Aaron and his sons over the tabernacle of witness; and they shall keep their charge of priesthood, and all things belonging to the altar, and within the veil; and the stranger that touches them shall die. 11 And the Lord spoke to Moses, saying, 12 Behold, I have taken the Levites from the midst of the children of Israel, instead of every male that opens the womb from among the children of Israel: they shall be their ransom, and the Levites shall be Mine. 13 For every firstborn is Mine; in the day in which I struck every firstborn in the land of Egypt, I sanctified to Myself every firstborn in Israel: both of man and beast, they shall be Mine: I am the Lord.