Charles Ellicott Commentary 2 Samuel 14:21

"And the king said unto Joab, Behold now, I have done this thing: go therefore, bring the young man Absalom back." — 2 Samuel 14:21 (ASV)

I have done. —This is the Hebrew text; the margin has you have done. The former is simply a form of granting Joab’s request; the latter would convey an implied censure on Joab’s stratagem, although in the next clause there is a compliance with his wish.