Numbers 3:4-6

Expanded Bible

⁴ But Nadab and Abihu died in the presence of the Lord when they offered ·the wrong kind of [^Lstrange; ^Can inappropriate performance of a ritual] fire before the Lord in the ·Desert [Wilderness] of Sinai [Lev. 10]. They had no sons. So Eleazar and Ithamar served as priests during the lifetime of their father Aaron.

⁵ The Lord said to Moses, ⁶ “Bring the tribe of Levi and ·present them to [^Lmake them stand before] Aaron the priest to ·help [minister to; assist] him.