Aaron married Elisheba, the daughter of Amminadab and the sister of Nahshon, and she gave birth to Nadab, Abihu, Eleazar, and Ithamar.

“Now bring your brother Aaron near, and his sons with him from among the sons of Israel, so that he may serve as priest to Me—Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron’s sons.

This is the sum of the things for the tabernacle, the tabernacle of the Testimony, as counted according to the command of Moses, for the work of the Levites, under the direction of Ithamar the son of Aaron the priest.

Then Moses said to Aaron and to his [younger] sons Eleazar and Ithamar, “Do not uncover your heads nor let your hair hang loose nor tear your clothes [as expressions of mourning], so that you will not die [also] and so that He will not express His wrath and anger toward all the congregation. But your relatives, the whole house of Israel, may mourn the burning which the Lord has brought about.

Then Moses said to Aaron, and to his surviving sons, Eleazar and Ithamar, “Take the grain offering that is left over from the offerings by fire to the Lord, and eat it unleavened beside the altar, for it is most holy.

But Moses diligently tried to find the goat [that had been offered] as the sin offering, and discovered that it had been burned up [as waste, not eaten]! So he was angry with Aaron’s surviving sons Eleazar and Ithamar, saying,

These are the names of the sons of Aaron: Nadab the firstborn, Abihu, Eleazar, and Ithamar.

But Nadab and Abihu died in the presence of the Lord when they offered strange (unholy, unacceptable, inappropriate) fire before the Lord in the Wilderness of Sinai; and they had no sons. So Eleazar and Ithamar served as priests in the presence and under the supervision of Aaron their father.

This is the service of the families of the sons of Gershon in the Tent of Meeting (tabernacle); and their duties shall be under the direction of Ithamar the son of Aaron, the [high] priest.

This is the work of the families of the sons of Merari, according to all their tasks in the Tent of Meeting (tabernacle), under the direction of Ithamar the son of Aaron, the priest.”

and he gave four carts and eight oxen to the sons of Merari, according to their service [in transporting the tabernacle], under the supervision of Ithamar the son of Aaron, the [high] priest.

To Aaron were born Nadab, Abihu, Eleazar, and Ithamar.

The sons of Amram: Aaron, Moses and Miriam. And the sons of Aaron: Nadab, Abihu, Eleazar, and Ithamar.

The divisions of the descendants of Aaron were these: the sons of Aaron were Nadab, Abihu, Eleazar, and Ithamar.

But Nadab and Abihu died before their father and had no sons; therefore Eleazar and Ithamar served as priests.

David, with Zadok of the sons of Eleazar and Ahimelech of the sons of Ithamar, divided them according to their offices for their assigned duties.

Since there were more chief men found among the descendants of Eleazar than among the descendants of Ithamar [because of Eli’s misfortunes, and Saul’s massacre of the priests at Nob], they were divided in this way: sixteen heads of fathers’ households of the descendants of Eleazar and eight of the descendants of Ithamar, corresponding to their fathers’ households.

So they were divided by lot, one group with the other; for they were officers of the sanctuary and officers (high priests) of God, both from the descendants of Eleazar and from the descendants of Ithamar.

Shemaiah, the son of Nethanel the scribe, from the Levites, recorded them in the presence of the king, the officers, Zadok the priest, Ahimelech the son of Abiathar [the priest who escaped Saul’s massacre at Nob], and the heads of the fathers’ households of the priests and of the Levites; one father’s household taken for Eleazar and one taken for Ithamar.

of the sons of Phinehas, Gershom; of the sons of Ithamar, Daniel; of the sons of David, Hattush;