C. F. Keil and Franz Delitzsch on 1 Kings 21:27-29

1Ki 21:27-29

This terrible threat made such an impression upon Ahab, that he felt deep remorse, and for a time at least was sincerely penitent. Rending the clothes, putting on the mourning garment of hair (שׂק), and fasting, are frequently mentioned as external signs of humiliation before God or of deep mourning on account of sin. יהלּך אט, he walked about lightly (slowly), like one in deep trouble. This repentance was neither hypocritical, nor purely external; but it was sincere even if it was not lasting and produced no real conversion. For the Lord Himself acknowledge it to be humiliation before Him (1Ki 21:29), and said to Elijah, that because of it He would not bring the threatened calamity upon Ahab’s house in his own lifetime, but only in the days of his son. אבי for אביא, as in 1Ki 21:21.