Numbers 3:4-6

Amplified Bible, Classic Edition

⁴ But Nadab and Abihu died before the Lord when they offered strange fire before the Lord in the Wilderness of Sinai; and they had no children. So Eleazar and Ithamar ministered in the priest’s office in the presence and under the supervision of Aaron their father.^(A)

⁵ And the Lord said to Moses,

⁶ Bring the tribe of Levi near and set them before Aaron the priest, that they may minister to him.