Numbers 3:13-15

Revised Standard Version Catholic Edition

¹³ for all the first-born are mine; on the day that I slew all the first-born in the land of Egypt, I consecrated for my own all the first-born in Israel, both of man and of beast; they shall be mine: I am the Lord.”

A Census of the Levites

¹⁴ And the Lord said to Moses in the wilderness of Sinai, ¹⁵ “Number the sons of Levi, by fathers’ houses and by families; every male from a month old and upward you shall number.”