2 Samuel 15:23, 37, 25-29, 24, 31-36, 30

And all the country wept with a loud voice, and all the people passed over: the king also himself passed over the brook Kidron, and all the people passed over, toward the way of the wilderness.

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

And the king said unto Zadok, Carry back the ark of God into the city: if I shall find favour in the eyes of the LORD, he will bring me again, and shew me both it, and his habitation: but if he thus say, I have no delight in thee; behold, here am I, let him do to me as seemeth good unto him. The king said also unto Zadok the priest, Art not thou a seer? return into the city in peace, and your two sons with you, Ahimaaz thy son, and Jonathan the son of Abiathar. See, I will tarry in the plain of the wilderness, until there come word from you to certify me. Zadok therefore and Abiathar carried the ark of God again to Jerusalem: and they tarried there.

And lo Zadok also, and all the Levites were 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 done passing out of the city.

And one told David, saying, Ahithophel is among the conspirators with Absalom. And David said, O LORD, I pray thee, turn the counsel of Ahithophel into foolishness. 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.

And David went up by the ascent of mount Olivet, and wept as he went up, and had his head covered, and he went barefoot: and all the people that was with him covered every man his head, and they went up, weeping as they went up.