The divisions of Aaron's descendants were as follows: Aaron's sons were Nadab and Abihu, Eleazar and Ithamar.
Nadab and Abihu died before their father died, and neither had any children. So Eleazar and Ithamar served as priests.
David, Eleazar's descendant Zadok, and Ithamar's descendant Ahimelech divided Aaron's descendants into groups for service.
Since Eleazar's descendants had more men who were family heads than Ithamar's descendants, they were divided so that Eleazar's descendants had 16 family leaders and Ithamar's descendants had 8 family leaders.
Both groups were divided impartially by drawing lots so that there were officers for the holy place and officers for God among both Eleazar's and Ithamar's descendants.
The scribe Shemaiah was a son of Nethanel and a descendant of Levi. Shemaiah recorded their names in the presence of the king, the princes, the priest Zadok, Ahimelech (son of Abiathar), and the family leaders of the priests and Levites. One family was chosen for Eleazar, another for Ithamar.
The first lot drawn was for Jehoiarib, the second for Jedaiah,
the third for Harim, the fourth for Seorim,
the fifth for Malchiah, the sixth for Mijamin,
the seventh for Hakkoz, the eighth for Abijah,
the ninth for Jeshua, the tenth for Shecaniah,
the eleventh for Eliashib, the twelfth for Jakim,
the thirteenth for Huppah, the fourteenth for Jeshebeab,
the fifteenth for Bilgah, the sixteenth for Immer,
the seventeenth for Hezir, the eighteenth for Happizzez,
the nineteenth for Pethahiah, the twentieth for Jehezkel,
the twenty-first for Jachin, the twenty-second for Gamul,
the twenty-third for Delaiah, the twenty-fourth for Maaziah.
These were their priestly groups when they went to serve at the LORD's temple. Their ancestor Aaron made these rules for them, as the LORD God of Israel had commanded him.
[The following men were leaders] for Levi's descendants [from Kohath]: Jehdeiah (for Amram's descendants through Shubael),
Isshiah ( [for Amram's descendants] through Rehabiah),
Jahath (for Izhar's descendants through Shelomoth),
Jeriah (for Hebron's descendants), Amariah (the second [of Hebron's descendants]), Jahaziel (the third [of Hebron's descendants]), Jekameam (the fourth [of Hebron's descendants]),
Shamir (for Uzziel's descendants through Micah),
and Zechariah (for [Uzziel's] descendants through Micah's brother Isshiah).
The following men were leaders from Levi's descendants from Merari: Mahli, Mushi, and Merari's son Jaaziah,
Shoham, Zaccur, and Ibri (for Merari's descendants through his son Jaaziah),
Eleazar (who had no sons, for Mahli's descendants),
Jerahmeel (for [Mahli's] descendants through Kish),
Mahli, Eder, and Jerimoth (for Mushi's descendants). These were Levi's descendants according to their families.
They drew lots as their relatives, Aaron's descendants, had done. They drew them in front of King David, Zadok, Ahimelech, and the leaders of the families of the priests and Levites. The families of the oldest brother were treated the same way as those of the youngest.