Another matter: "And the truth of the Lord endures forever." The Lord enticed Elijah to go and appear before Ahab, as it is stated: "And the word of the Lord came to Elijah, saying, 'Go, show yourself to Ahab'" (1 Kings 18:1). Elijah said to God: "How can I go, for until now he has not repented?" The Lord said to him: "When I watered My world, there was one patch of land that did not receive any rain, as it is stated: 'And a mist would rise from the earth and water the whole surface of the ground' (Genesis 2:6). Even now, go and show yourself to Ahab, and I will give rain."
Kingdom of Elijah of Ahab
Midrash Tehillim 117:3