1 Kings 18:16-20

So Obadiah went to meet Ahab and informed him; then Ahab went to meet Elijah.

When Ahab saw Elijah, Ahab said to him, “Is this you, the cause of disaster to Israel?”

He said, “I have not brought disaster to Israel, but you and your father’s house have, because you have abandoned the commandments of the Lord and you have followed the Baals.

Now then, send orders and gather to me all Israel at Mount Carmel, together with 450 prophets of Baal and four hundred prophets of the Asherah, who eat at Jezebel’s table.” God or Baal on Mount Carmel

So Ahab sent orders among all the sons of Israel and brought the prophets together at Mount Carmel.