Then Jehu went into the house of Baal with Jehonadab the son of Rechab, and he said to the worshipers of Baal, “Search, and see that there is no servant of the LORD here among you, but only the worshipers of Baal.”
Jehu, pushing on his work, is here, I. Courting the friendship of a good man, Jehonadab the son of Rechab, Kg2 10:15, Kg2 10:16. This Jehonadab, though mortified to the world and meddling little with the business of it (as appears by his charge to his posterity, which they religiously observed 300 years after, not to drink wine nor dwell in cities, Jer 35:6, etc.)...
Commenting on 2 Kings 10:15-28
And Jehu went, and Jehonadab the son of Rechab, into the house of Baal,.... Who no doubt was led into the secret, and knew the design of Jehu, or he would not have gone into such an idolatrous place: and said unto the worshippers of Baal, search and look, that there be here with you none of the servants of the Lord, but the worshippers...
And Jehu went, and Jehonadab the son of Rechab, into the house of Baal, and said unto the worshippers of Baal, Search, and look that there be here with you none of the servants of the LORD, but the worshippers of Baal only. (i) Thus God would have his servants preserved and idolaters destroyed, as in his law he gives express command, .