II Samuel 15:24-27, 35-36

There was Zadok also, and all the Levites with him, bearing the ark of the covenant of God. And they set down the ark of God, and Abiathar went up until all the people had finished crossing over from the city. Then the king said to Zadok, “Carry the ark of God back into the city. If I find favor in the eyes of the LORD, He will bring me back and show me both it and His dwelling place. But if He says thus: ‘I have no delight in you,’ here I am, let Him do to me as seems good to Him.” The king also said to Zadok the priest, “Are you not a seer? Return to the city in peace, and your two sons with you, Ahimaaz your son, and Jonathan the son of Abiathar.

And do you not have Zadok and Abiathar the priests with you there? Therefore it will be that whatever you hear from the king’s house, you shall tell to Zadok and Abiathar the priests. Indeed they have there with them their two sons, Ahimaaz, Zadok’s son, and Jonathan, Abiathar’s son; and by them you shall send me everything you hear.”