181 And David marshalled the people that were with him, and set captains of thousands and captains of hundreds over them. 2 And David sent forth the people, a third part under the hand of Joab, and a third part under the hand of Abishai the son of Zeruiah, Joab's brother, and a third part under the hand of Ittai the Gittite. And the king said to the people, I will surely go forth with you myself also. 3 But the people said, Thou shalt not go forth, for if we should in any case flee, they will not care for us; neither if half of us die, will they care for us; for thou art worth ten thousand of us; and now it is better that thou succour us out of the city. 4 And the king said to them, I will do what is good in your sight. And the king stood by the gate-side, and all the people came out by hundreds and by thousands.
Matthew Henry's Commentary on 2 Samuel 18:1-4
Commentary on 2 Samuel 18:1-8
(Read 2 Samuel 18:1-8)
How does David render good for evil! Absalom would have only David smitten; David would have only Absalom spared. This seems to be a resemblance of man's wickedness towards God, and God's mercy to man, of which it is hard to say which is most amazing. Now the Israelites see what it is to take counsel against the Lord and his anointed.