1 Chronicles 16:39-40

39And he left aZadok the priest and his brothers the priests before the tabernacle of the Lord bin the high place that was at Gibeon 40to offer burnt offerings to the Lord con the altar of burnt offering dregularly morning and evening, to do all that is written in the Law of the Lord that he commanded Israel.

1 Chronicles 24:1-3

David Organizes the Priests

1The divisions of the sons of Aaron were these. The sons of eAaron: Nadab, Abihu, Eleazar, and Ithamar. 2 fBut Nadab and Abihu died before their father and had no children, so Eleazar and Ithamar became the priests. 3With the help of gZadok of the sons of Eleazar, and Ahimelech of the sons of Ithamar, David organized them according to the appointed duties in their service.
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