2 Kings 10:31 - Joseph Benson’s Commentary on the Old and New Testaments

But Jehu took no care to walk in the law of the Lord God of Israel He abolished the worship of Baal, but did not keep up the worship of God, nor walk in his law. He showed great zeal and care for the rooting out of a false religion; but in the true religion he showed no care, took no heed: was not solicitous to please God and do his duty. With all his heart His heart, his whole heart, was not engaged in, nor influenced by religion; nor was he truly zealous for the glory of God, and the advancement of true and genuine piety in himself and others. It is evident his own religion was very superficial, and yet God made use of him as an instrument of effecting some reformation in Israel. It is a pity that those who do good to others, are not always good themselves.