15 And when he departed from there, he met Jehon'adab the son of Rechab coming to meet him; and he greeted him, and said to him, "Is your heart true to my heart as mine is to yours?" And Jehon'adab answered, "It is." Jehu said, "If it is, give me your hand." So he gave him his hand. And Jehu took him up with him into the chariot. 16 And he said, "Come with me, and see my zeal for the Lord." So he had him ride in his chariot. 17 And when he came to Sama'ria, he slew all that remained to Ahab in Sama'ria, till he had wiped them out, according to the word of the Lord which he spoke to Eli'jah.
18 Then Jehu assembled all the people, and said to them, "Ahab served Ba'al a little; but Jehu will serve him much. 19 Now therefore call to me all the prophets of Ba'al, all his worshipers and all his priests; let none be missing, for I have a great sacrifice to offer to Ba'al; whoever is missing shall not live." But Jehu did it with cunning in order to destroy the worshipers of Ba'al. 20 And Jehu ordered, "Sanctify a solemn assembly for Ba'al." So they proclaimed it. 21 And Jehu sent throughout all Israel; and all the worshipers of Ba'al came, so that there was not a man left who did not come. And they entered the house of Ba'al, and the house of Ba'al was filled from one end to the other. 22 He said to him who was in charge of the wardrobe, "Bring out the vestments for all the worshipers of Ba'al." So he brought out the vestments for them. 23 Then Jehu went into the house of Ba'al with Jehon'adab the son of Rechab; and he said to the worshipers of Ba'al, "Search, and see that there is no servant of the Lord here among you, but only the worshipers of Ba'al."
Matthew Henry's Commentary on 2 Kings 10:15-23
Commentary on 2 Kings 10:15-28
(Read 2 Kings 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.