2 Samuel 17:5

And it came to pass, that when David was come to the top of the mount, where he worshipped God, behold, Hushai the Archite came to meet him with his coat rent, and earth upon his head: Unto whom David said, If thou passest on with me, then thou shalt be a burden unto me: But if thou return to the city, and say unto Absalom, I will be thy servant, O king; as I have been thy father's servant hitherto, so will I now also be thy servant: then mayest thou for me defeat the counsel of Ahithophel. And hast thou not there with thee Zadok and Abiathar the priests? therefore it shall be, that what thing soever thou shalt hear out of the king's house, thou shalt tell it to Zadok and Abiathar the priests. Behold, they have there with them their two sons, Ahimaaz Zadok's son, and Jonathan Abiathar's son; and by them ye shall send unto me every thing that ye can hear. So Hushai David's friend came into the city, and Absalom came into Jerusalem.

And it came to pass, when Hushai the Archite, David's friend, was come unto Absalom, that Hushai said unto Absalom, God save the king, God save the king. And Absalom said to Hushai, Is this thy kindness to thy friend? why wentest thou not with thy friend? And Hushai said unto Absalom, Nay; but whom the LORD, and this people, and all the men of Israel, choose, his will I be, and with him will I abide. And again, whom should I serve? should I not serve in the presence of his son? as I have served in thy father's presence, so will I be in thy presence.