(There was never a man like Ahab, who sold himself to do evil in the eyes of the LORD, urged on by Jezebel his wife. He behaved in the vilest manner by going after idols, like the Amorites the LORD drove out before Israel.)

When Ahab heard these words, he tore his clothes, put on sackcloth and fasted. He lay in sackcloth and went around meekly.
Then the word of the LORD came to Elijah the Tishbite: "Have you noticed how Ahab has humbled himself before me? Because he has humbled himself, I will not bring this disaster in his day, but I will bring it on his house in the days of his son." 1 Kings 21:25-29

Grace and forgiveness : Even though Ahab was so evil, God relented when Ahab humbled himself before the Lord.

Consequences : However, Ahab's actions affected the life of his son.

Such powerful lessons in a mere 5 verses.