Seest thou how Ahab humbleth himself before me? because he humbleth himself before me, I will not bring the evil in his days: but in his son's days will I bring the evil upon his house. Seest thou how Ahab humbleth himself - He did abase himself; he did truly repent him of his sins, and it was such a repentance as was genuine in the sight of God: He humbleth himself Before Me.
The penitent heart ever meets the merciful eye of God; repentance is highly esteemed by the Father of compassion, even where it is comparatively shallow and short-lived. Any measure of godly sorrow has a proportionate measure of God's regard; where it is deep and lasting, the heart of God is set upon it. He that mourns shall be comforted; thus hath God spoken, and though repentance for our past sins can purchase no favor, yet without it God will not grant us his salvation.
Commentary on the Bible, by Adam Clarke [1831].