Numbers 3:13-15

Holman Christian Standard Bible

¹³ because every firstborn belongs to Me. At the time I struck down every firstborn in the land of Egypt,^(A) I consecrated every firstborn in Israel to Myself, both man and animal. They are Mine; I am Yahweh.”^(B)

The Levitical Census

¹⁴ The Lord spoke to Moses in the Wilderness of Sinai: ¹⁵ “Register the Levites by their ancestral houses and their clans. You are to register every male one month old or more.”