Numbers 3:4-6

Contemporary English Version

^4 (A) But the Lord killed Nadab and Abihu in the Sinai Desert when they used fire that was unacceptable^[a] in their offering to the Lord.^[b] And because Nadab and Abihu had no sons, only Eleazar and Ithamar served as priests with their father Aaron.

The Duties of the Levites

⁵ The Lord said to Moses:

⁶ Assign the Levi tribe to Aaron the priest. They will be his assistants