You have indeed defeated Edom, and your heart has become proud. Glory in that and stay at home. Why should you stir up trouble so that you fall—you and Judah with you?”
For several successions after the division of the kingdoms that of Judah suffered much by the enmity of Israel. After Asa's time, for several successions, it suffered more by the friendship of Israel, and by the alliance and affinity made with them. But now we meet with hostility between them again, which had not been for some ages before. I.
Commenting on 2 Kings 14:8-14
And Judah was put to the worse before Israel,.... Could not face them; but, as Josephus (d) says, a sudden fear and consternation seized them, and before they joined battle with the Israelites, turned their backs: and they fled every man to their tents; to their cities, as the Targum, and left their king alone. (d) Antiqu. l. 9. c. 9. sect. 3.
Thou hast indeed smitten Edom, and thine heart hath lifted thee up: glory [of this], and tarry at home: for why shouldest thou meddle to [thy] hurt, that thou shouldest fall, [even] thou, and Judah with thee? (f) Brag of the victory, so that you stay at home and do not provoke me.