1 Chronicles 24:5-6

5They used lots to decide the work of each group. The families of both Eleazar and Ithamar included officers for the temple as well as priests.

6Shemaiah was the secretary who wrote down the names in each group. He was the son of Nethanel, a Levite. Shemaiah wrote down the names while the king and his officers watched. Zadok the priest, Abiathar's son Ahimelech and the leaders of the priests' clans and of the other Levite clans were also watching. When they threw the lots, they would choose a family from Eleazar's descendants, then a family from Ithamar's descendants, and so on.