2 Samuel 15:24

And lo, Zadok also and all the Levites were with him, bearing the Ark of the Covenant of God; and they set down the ark of God, in order to give the people that were still coming time to join the procession. And Abiathar went up, on the road which led over Mount Olivet toward the east, until all the people had done passing out of the city. Abiathar was the high priest, and Zadok was the chief officer in charge of the ark.