2 Samuel 15:35-37

15:35 Zadok and Abiathar the priests will be there with you. Everything you hear in the king’s palace you must tell Zadok and Abiathar the priests. 15:36 Furthermore, their two sons are there with them, Zadok’s son Ahimaaz and Abiathar’s son Jonathan. You must send them to me with any information you hear.”

15:37 So David’s friend Hushai arrived in the city, just as Absalom was entering Jerusalem.