1 Chronicles 24:1-5, 30-31

The family of Aaron was grouped as follows: Aaron’s sons were Nadab, Abihu, Eleazar, and Ithamar. Nadab and Abihu died before their father and left no sons. So Eleazar and Ithamar filled the office of priest. David assigned Zadok from the family of Eleazar and Ahimelech from the family of Ithamar and assigned them to separate divisions for carrying out their appointed ministries. It turned out that there were more leaders in Eleazar’s family than in Ithamar’s and so they divided them proportionately: sixteen clan leaders from Eleazar’s family and eight clan leaders from Ithamar’s family. They assigned the leaders by lot, treating both families alike, for there were officials of the sanctuary and officials of God among both the Eleazar and Ithamar families.

And from the sons of Mushi: Mahli, Eder, and Jerimoth. These were the Levites by their families. They also cast lots, the same as their kindred the sons of Aaron had done, in the presence of David the king, Zadok, Ahimelech, and the leaders of the priestly and Levitical families. The families of the oldest and youngest brothers were treated the same.