Matthew Henry on 2 Samuel 18:1-8
Which way David raised an army here, and what reinforcements were sent him, we are not told; many, it is likely, from all the coasts of Israel, at least from the neighbouring tribes, came in to his assistance, so that, by degrees, he was able to make head against Absalom, as Ahithophel foresaw. Now here we have,
I. His army numbered and marshalled, Sa2 18:1, Sa2 18:2. He had, no doubt, committed his cause to God by prayer, for that was his relief in all his afflictions; and then he took an account of his forces. Josephus says they were, in all, but about 4000. These he divided into regiments and companies, to each of which he appointed proper officers, and then disposed them, as is usual, in…
Read the whole note in the consoleAdam Clarke on 2 Samuel 18:3
But now thou art worth ten thousand of us - The particle יתה attah, now, is doubtless a mistake for the pronoun אתה attah, thou; and so it appears to have been read by the Septuagint, the Vulgate, and the Chaldee, and by two of Kennicott's and De Rossi's MSS.
John Gill on 2 Samuel 18:4
And the king said unto them, what seemeth you best I will do,.... Which was an instance of great condescension in him; and it was his wisdom and prudence to yield to them at such a time as this, and especially as their sentiments were founded on affection and loyalty to him:
and the king stood by the gate side; of the city of Mahanaim:
and all the people came out by hundreds, and by thousands; and passed by him, to whom no doubt he gave his blessing and best wishes; and, as Abarbinel thinks, now it was he composed and said the twentieth psalm, "The Lord hear thee in the day of trouble", &c. Psalm 20:1.
Keil & Delitzsch on 2 Samuel 18:4-5
The king gave his consent to these proposals, and went to the side of the gate, whilst the people went out by hundreds and thousands; but in the hearing of all he commanded the principal generals, "Mildly for me (i.e., deal gently for my sake) with the boy Absalom." לאט is not the imperative of לאט, to cover over, which would not suit the connection, and could not be construed with ל, but an adverb from אט, as in Isa 8:6; Kg1 21:27; Job 15:11.