Thus he speaks, either because he had some notice of their intentions thus to do; or to make trial of them, whether they would do so, or would be true to him and his designs; or to signify to them his intentions of fighting against them, if they did so, that by the terror hereof he might bring them to a compliance with him.
Related Commentaries of 2 Kings 10:3
2 Kings 10:3
3 Look even out the best and meetest of your master's sons, and set him on his father's throne, and fight for your master's house.