Matthew Henry on 2 Samuel 16:15–end
Absalom had notice sent him speedily by some of his friends at Jerusalem that David had withdrawn, and with what a small retinue he had gone; so that the coasts were clear, Absalom might take possession of Jerusalem when he pleased. The gates were open, and there was none to oppose him. Accordingly he came without delay (Sa2 16:15), extremely elevated, no doubt, with this success at first, and that that in which, when he formed his design, he probably apprehended the greatest difficulty, was so easily and effectually done. Now that he is master of Jerusalem he concludes all his own, the country will follow of course. God suffers wicked men to prosper awhile in their wicked plots, even beyond…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Samuel 16:15
Hushai said unto Absalom, God save the king--Hushai's devotion to David was so well-known, that his presence in the camp of the conspirators excited great surprise. Professing, however, with great address, to consider it his duty to support the cause which the course of Providence and the national will had seemingly decreed should triumph, and urging his friendship for the father as a ground of confidence in his fidelity to the son, he persuaded Absalom of his sincerity, and was admitted among the councillors of the new king.
Adam Clarke on 2 Samuel 16:18
Whom the Lord and this people - choose - Here is an equivocation; Hushai meant in his heart that God and all the people of Israel had chosen David; but he spake so as to make Absalom believe that he spoke of him: for whatever of insincerity may appear in this, Hushai is alone answerable. What he says afterwards may be understood in the same way.
John Gill on 2 Samuel 16:19
And again, whom should I serve?.... Or "secondly" (e), a second reason is here given for serving Absalom: the first was the choice of God and the people, the second follows:
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: he signifies, that as the kingdom was not translated into another family, but continued in succession in David's house, the alteration made was of no great consequence; it was indifferent to him whom he served, the father or the son; and he could as freely, and would as faithfully serve the son as the father; nor did he think it any breach of friendship to David, nor would David resent it, that he shou…