2 Samuel 15:34-38

But if you return to the city and say to Absalom, ‘I will be your servant, O king; even as I was your father’s servant in time past, so now I will also be your servant,’ then you can foil the advice of Ahithophel for me.

Are Zadok and Abiathar the priests not with you there? So it shall be that whatever you hear from the king’s house, you shall report to Zadok and Abiathar the priests.

Behold their two sons are there with them, Ahimaaz, Zadok’s son and Jonathan, Abiathar’s son; and by them you shall send me everything that you hear.”

So Hushai, David’s friend, came into the city, and Absalom came into Jerusalem.