Then Aaron married Elisheba daughter of Amminadab, sister of Nahshon. She bore him Nadab, Abihu, Eleazar, and Ithamar.

"You are to bring your brother Aaron, along with his sons, from among the Israelis so they can serve as priests for me: that is, Aaron and his sons Nadab, Abihu, Eleazar, and Ithamar.

Here is a summary of materials for the Tent of Meeting that was compiled at Moses' direction, the work of the descendants of Levi under the direction of Aaron the priest's son Ithamar.