Exodus 6:23; Exodus 28:1; Exodus 38:21

Exodus 6:23

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

Exodus 28:1

1 "Then bring near to yourself Aaron your brother, and his sons with him, from among the sons of Israel, to minister as priest to Me-Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron's sons.

Exodus 38:21

21 This is the number of the things for the tabernacle, the tabernacle of the testimony, as they were numbered according to the command of Moses, for the service of the Levites, by the hand of Ithamar the son of Aaron the priest.