2 Samuel 15:35-36

35And 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.

36Indeed 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.”