Exodus 6:23,25
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

1 Chronicles 6:3-15,50-53
And the children of Amram; Aaron, and Moses, and Miriam. The sons also of Aaron; Nadab, and Abihu, Eleazar, and Ithamar.
Nave's Topical Index—AKJV

1 Chronicles 24:1
Now these are the divisions of the sons of Aaron. The sons of Aaron; Nadab, and Abihu, Eleazar, and Ithamar.
Nave's Topical Index—AKJV