Exodus 6:23
And Aaron took him Elisheba, daughter of Amminadab, sister of Naashon, to wife; and she bore him Nadab, and Abihu, Eleazar, and Ithamar.
Nave's Topical Index—AKJV

Exodus 28:1
And take you to you Aaron your brother, and his sons with him, from among the children of Israel, that he may minister to me in the priest's office, even Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron's sons.
Nave's Topical Index—AKJV