Numbers 26:61

New American Bible - revised edition

But Nadab and Abihu died when they offered unauthorized fire before the Lord.

Cross References

Exodus 6:23

Aaron married Elisheba, Amminadab’s daughter, the sister of Nahshon; she bore him Nadab, Abihu, Eleazar and Ithamar.

Numbers 3:4

But Nadab and Abihu died in the presence of the Lord when they offered unauthorized fire before the Lord in the wilderness of Sinai; and they left no sons. So only Eleazar and Ithamar served as priests during the lifetime of their father Aaron. Levites in Place of the Firstborn.