10:15-28 Is thine heart right? This is a question we should often put to ourselves. I make a fair profession, have gained a reputation among men, but, is my heart right? Am I sincere with God? Jehonadab owned Jehu in the work, both of revenge and of reformation. An upright heart approves itself to God, and seeks no more than his acceptance; but if we aim at the applause of men, we are upon a false foundation. Whether Jehu looked any further we cannot judge. The law of God was express, that idolaters were to be put to death. Thus idolatry was abolished for the present out of Israel. May we desire that it be rooted out of our hearts.

15-18. Jehonadab the son of Rechab—(See 1Ch 2:55). A person who, from his piety and simple primitive manner of life (Jer 35:1-19), was highly esteemed, and possessed great influence in the country. Jehu saw in a moment the advantage that his cause would gain from the friendship and countenance of this venerable man in the eyes of the people, and accordingly paid him the distinguished attention of inviting him to a seat in his chariot.

give me thine hand—not simply to aid him in getting up, but for a far more significant and important purpose—the giving, or rather joining hands, being the recognized mode of striking a league or covenant, as well as of testifying fealty to a new sovereign; accordingly, it is said, "he [Jehonadab] gave him [Jehu] his hand."