Numbers 3:13-15

Common English Bible

¹³ because all the oldest males are mine. When I killed all the oldest males in the land of Egypt, I reserved for myself all the oldest males in Israel, both humans and animals. They are mine; I am the Lord.

¹⁴ The Lord spoke to Moses in the Sinai desert: ¹⁵ Enroll the Levites by their households and their clans. You will enroll all the males over one month old.