And it came to pass, that, when Jehu was executing judgment upon the house of Ahab, and found the princes of Judah, and the sons of the brethren of Ahaziah, that ministered to Ahaziah, he slew them.

So while Jehu was executing judgment on the house of Ahab, he found the rulers of Judah and the sons of Ahaziah’s brothers who were serving Ahaziah, and he killed them.