Numbers 3:4

4 And 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: and Eleazar and Ithamar ministered in the priest's office in the sight of Aaron their father.

Numbers 3:4 In-Context

2 And these are the names of the sons of Aaron; Nadab the firstborn, and Abihu, Eleazar, and Ithamar.
3 These are the names of the sons of Aaron, the priests which were anointed , whom he consecrated to minister in the priest's office .
4 And 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: and Eleazar and Ithamar ministered in the priest's office in the sight of Aaron their father.
5 And the LORD spake unto Moses, saying ,
6 Bring the tribe of Levi near , and present them before Aaron the priest, that they may minister unto him.
The King James Version is in the public domain.