Numbers 3:13-15

World English Bible

¹³ for all the firstborn are mine. On the day that I struck down all the firstborn in the land of Egypt I made holy to me all the firstborn in Israel, both man and animal. They shall be mine. I am Yahweh.”

¹⁴ Yahweh spoke to Moses in the wilderness of Sinai, saying, ¹⁵ “Count the children of Levi by their fathers’ houses, by their families. You shall count every male from a month old and upward.”