C. F. Keil and Franz Delitzsch on 2 Samuel 14:22

2Sa 14:22

Joab thanked the king for this, and blessed him: “To-day thy servant knoweth that I have found grace in thy sight, my lord, O king, in that the king hath fulfilled the request of his servant.” It is pretty evident from this, that Joab had frequently applied to David for Absalom’s return, without any attention being paid to his application. David therefore suspected that Joab had instructed the woman of Tekoah. The Chethib עבדּו is not to be exchanged for the Keri עבדּך.