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Ahimaaz was a well-known runner 2 Samuel 18:27. Speed was a heroic virtue in those simple times (compare 2 Samuel 2:18). In Hezekiah‘s reign 2 Chronicles 30:6, 2 Chronicles 30:10 we find an establishment of running post-men; and the same name (“runners”) is given Esther 3:13 to the Persian posts, though at that time they rode on mules and camels.

Bear tidings - The original word is used almost exclusively of bearing good tidings, and hence, is rendered in the Septuagint (though not always) εὐαγγίζεσθαι euangelizesthai 2 Samuel 4:10; 1 Samuel 31:9. In 2 Samuel 18:21, it is not “carry the good tidings,” but “tell,” simply “announce.”

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.