Numbers 3:13-15

New International Version - UK

¹³ for all the firstborn are mine. When I struck down all the firstborn in Egypt, I set apart for myself every firstborn in Israel, whether human or animal. They are to be mine. I am the Lord.’

¹⁴ The Lord said to Moses in the Desert of Sinai, ¹⁵ ‘Count the Levites by their families and clans. Count every male a month old or more.’