(20) Thou shalt bear no tidings.--Ahimaaz appears to have been in favour both with David (comp. 2Samuel 18:27) and with Joab. Joab, therefore, well knowing how painful to David would be the news of the death of Absalom, refused to let Ahimaaz bear it. The word is used, with rare exceptions, of good tidings.

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.And Joab said unto him, thou shall not bear tidings this day,.... Because Joab knew the tidings of Absalom's death would not be acceptable to the king; and Ahimaaz being a good man, and the son of a priest, for whom Joab had a respect, he would not send the tidings by him, which he was sensible would not recommend him to the king:

but thou shalt bear tidings another day; when any salvation is wrought, or victory obtained, the tidings of which will be welcome:

but this day thou shall bear no tidings, because the king's son is dead; and thou must carry the news concerning his death, which it is not proper thou shouldest, being a priest, nor will it be to thine advantage.