Numbers 3:4-6

New Living Translation

⁴ But Nadab and Abihu died in the Lord’s presence in the wilderness of Sinai when they burned before the Lord the wrong kind of fire, different than he had commanded. Since they had no sons, this left only Eleazar and Ithamar to serve as priests with their father, Aaron.

⁵ Then the Lord said to Moses, ⁶ “Call forward the tribe of Levi, and present them to Aaron the priest to serve as his assistants.