David said, "My son Solomon is young and inexperienced, and the house to be built for the LORD should be of great magnificence and fame and splendor in the sight of all the nations. Therefore I will make preparations for it." So David made extensive preparations before his death.With the help of Zadok a descendant of Eleazar and Ahimelech a descendant of Ithamar, David separated the priests into divisions for their appointed order of ministering. A larger number of leaders were found among Eleazar's descendants than among Ithamar's, and they were divided accordingly: sixteen heads of families from Eleazar's descendants and eight heads of families from Ithamar's descendants. They divided them impartially by drawing lots, for there were officials of the sanctuary and officials of God among the descendants of both Eleazar and Ithamar.
The scribe Shemaiah son of Nethanel, a Levite, recorded their names in the presence of the king and of the officials: Zadok the priest, Ahimelech son of Abiathar and the heads of families of the priests and of the Levites—one family being taken from Eleazar and then one from Ithamar.
The first lot fell to Jehoiarib, the second to Jedaiah,
the third to Harim, the fourth to Seorim,
the fifth to Malkijah, the sixth to Mijamin, And so on all the way to the twenty third. The priests were important. They did just about everything you could possibly do in the temple. That's why they have so many chapters and records in the bible