2nd Samuel 15:24 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. 27 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.
[Patriarchs & Prophets pp 735] In the city the priests might do him good service by learning the movements and purposes of the rebels, and secretly communicating them to the king by their sons, Ahimaaz and Jonathan. As the priests turned back toward Jerusalem a deeper shadow fell upon the departing throng. Their king a fugitive, themselves outcasts, forsaken even by the ark of God—the future was dark with terror and foreboding. “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.
And one told David, saying, Ahithophel is among the conspirators with Absalom.” Again David was forced to recognize in his calamities the results of his own sin. The defection of Ahithophel, the ablest and most wily of political leaders, was prompted by revenge for the family disgrace involved in the wrong to Bathsheba, who was his granddaughter. “And David said, O Lord, I pray Thee, turn the counsel of Ahithophel into foolishness.” Upon reaching the top of the mount, the king bowed in prayer, casting upon God the burden of his soul and humbly supplicating divine mercy. His prayer seemed to be at once answered.
Hushai the Archite, a wise and able counselor, who had proved himself a faithful friend to David, now came to him with his robes rent and with earth upon his head, to cast in his fortunes with the dethroned and fugitive king. David saw, as by a divine enlightenment, that this man, faithful and true-hearted, was the one needed to serve the interests of the king in the councils at the capital. At David's request Hushai returned to Jerusalem to offer his services to Absalom and defeat the crafty counsel of Ahithophel.
2nd Samuel 15:36 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. 37 So Hushai David's friend came into the city, and Absalom came into Jerusalem.
May God add His blessing to the study of His word. "Good night" and God bless!