Numbers 26:61
Nadab and Abihu died because they offered unauthorized fire in Jehovah's presence.
Leviticus 10:1-2
Aaron's sons Nadab and Abihu each took an incense burner. They put burning coals and incense in it. Then in Jehovah's presence they offered this unauthorized fire.
Numbers 3:4
Nadab and Abihu died in Jehovah's presence because they offered unauthorized fire in his presence in the Desert of Sinai. They had no children. So only Eleazar and Ithamar served as priests during the lifetime of their father Aaron.
1 Chronicles 24:1-2
The divisions of Aaron's descendants were as follows: Aaron's sons were Nadab and Abihu, Eleazar and Ithamar.
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