Amram’s children: Aaron, Moses, and Miriam.
Aaron’s sons: Nadab, Abihu, Eleazar, and Ithamar.

The divisions of the descendants of Aaron were as follows: Aaron’s sons were Nadab, Abihu, Eleazar, and Ithamar.

Their job was to help Aaron's descendants in the service of the Lord's temple. They were to take care of the courtyards, the rooms, ceremonial purification of all holy items, and other jobs related to the service of God's temple.

These were the areas where Aaron's descendants lived: The following belonged to the Kohathite clan, for they received the first allotment:

Jehoiada, the leader of Aaron's descendants, brought 3,700 men with him,

These are Aaron’s sons: his son Eleazar,
his son Phinehas, his son Abishua,

Aaron’s sons were given:

Hebron (a city of refuge), Libnah and its pasturelands, Jattir, Eshtemoa and its pasturelands,

These individuals also cast lots corresponding to their relatives, Aaron's descendants, in the presence of King David, Zadok, and Ahimelech, and in the presence of the heads of the ancestral households of the priests and of the descendants of Levi, and the eldest was treated as impartially as was the younger brother.

Amram’s sons: Aaron and Moses.

Aaron, along with his descendants, was set apart forever to consecrate the most holy things, to burn incense in the presence of Yahweh, to minister to Him, and to pronounce blessings in His name forever.

They are to carry out their responsibilities for the tent of meeting, for the holy place, and for their relatives, the sons of Aaron, in the service of the Lord’s temple.”

These had their assigned duties for service when they entered the Lord’s temple, according to their regulations, which they received from their ancestor Aaron, as the Lord God of Israel had commanded him.

But Aaron and his descendants offered sacrifices on the altar for burnt offerings and on the altar for incense as they had been assigned to do in the most holy sanctuary. They made atonement for Israel, just as God's servant Moses had ordered.

for Levi there was Kemuel's son Hashabiah; for Aaron there was Zadok;

And David gathered the sons of Aaron and the Levites.