22 Then Ahimaaz the son of Zadok said yet again to Joab, "But come what may, please let me also run after the Cushite." Joab said, "Why do you want to run, my son, since that you will have no reward for the news?"
*Minor differences ignored. Grouped by changes, with first version listed as example.
Then said Ahimaaz the son of Zadok yet again to Joab,.... He could not be easy, even though a messenger was dispatched, but pressed Joab still:
but howsoever, let me, I pray thee, also run after Cushi; only permit me to go after him, though not as a messenger:
and Joab said, wherefore wilt thou run, my son? having a great affection for him, and concerned that he should take trouble on him to no purpose:
seeing thou hast no tidings ready; no news to carry, but what Cushi is gone with, and so can have no audience of the king, nor any reward from him.
As Ahimaaz still expressed a wish to hasten to the king, even after Cushi had been sent, and could not be induced to relinquish his purpose by the repeated expostulations of Joab, the latter at length permitted him to run. And he ran so fast, that he got before Cushi. מה ויהי: let whatever will happen. וּלכה is the pronoun "to thee," as in Genesis 27:37, and not the imperative of הלך, "thou mayest go." The meaning is, "and there is no striking message for thee," no message that strikes the mark, or affects anything. We must supply "he said" in thought before 2-Samuel 18:23. There was the less necessity to write it here (as in 1-Samuel 1:20), since it is perfectly obvious from the repetition of מה ויהי that it is Ahimaaz who is speaking. Ahimaaz then ran by the way of the plain, i.e., the way which lies through or across the plain of the Jordan. Now he could not possibly have taken this road, if the battle had been fought in a wood on the eastern side of the Jordan, and he had wanted to hurry from the scene of battle to Mahanaim; for in that case he would have taken a circuitous route two or three times the distance of the straight road, so that it would have been utterly impossible for him to get there before the Cushite, however quickly he might run. This notice therefore furnishes a decisive proof that the battle was fought upon the mountains of Ephraim, in the land to the west of the Jordan, since the straight road thence to Mahanaim would lie through the valley of the Jordan.
*More commentary available at chapter level.