Numbers 3:4-6

Modern English Version

⁴ Nadab and Abihu died before the Lord when they brought strange fire before the Lord in the Wilderness of Sinai, and they had no children, and Eleazar and Ithamar ministered as priests in the sight of Aaron their father.

Duties of the Levites

⁵ The Lord spoke to Moses, saying: ⁶ Bring the tribe of Levi near, and present them before Aaron the priest, and they will minister to him.