24 David was sitting between the two gates. The sentry had gone up to the top of the gate on the wall and looked around. He saw a solitary runner. 25 The sentry called down and told the king. The king said, "If he's alone, it must be good news!" 26 the sentry saw another runner and called down to the gate, "Another runner all by himself." And the king said, "This also must be good news." 27 Then the sentry said, "I can see the first man now; he runs like Ahimaaz son of Zadok." "He's a good man," said the king. "He's bringing good news for sure."
Matthew Henry's Commentary on 2 Samuel 18:24-27
Commentary on 2 Samuel 18:19-33
(Read 2 Samuel 18:19-33)
By directing David to give God thanks for his victory, Ahimaaz prepared him for the news of his son's death. The more our hearts are fixed and enlarged, in thanksgiving to God for our mercies, the better disposed we shall be to bear with patience the afflictions mixed with them. Some think David's wish arose from concern about Absalom's everlasting state; but he rather seems to have spoken without due thought. He is to be blamed for showing so great fondness for a graceless son. Also for quarrelling with Divine justice. And for opposing the justice of the nation, which, as king, he had to administer, and which ought to be preferred before natural affection. The best men are not always in a good frame; we are apt to over-grieve for what we over-loved. But while we learn from this example to watch and pray against sinful indulgence, or neglect of our children, may we not, in David, perceive a shadow of the Saviour's love, who wept over, prayed for, and even suffered death for mankind, though vile rebels and enemies.