1 Chronicles 16:39-40

16:39 Zadok the priest and his fellow priests served before the Lord’s tabernacle at the worship center in Gibeon, 16:40 regularly offering burnt sacrifices to the Lord on the altar for burnt sacrifice, morning and evening, according to what is prescribed in the law of the Lord which he charged Israel to observe.

1 Chronicles 24:1-3

David Organizes the Priests

24:1 The divisions of Aaron’s descendants were as follows:

The sons of Aaron:

Nadab, Abihu, Eleazar, and Ithamar.

24:2 Nadab and Abihu died before their father did; they had no sons. Eleazar and Ithamar served as priests.

24:3 David, Zadok (a descendant of Eleazar), and Ahimelech (a descendant of Ithamar) divided them into groups to carry out their assigned responsibilities.