What does 2 Kings 1:18 mean?

Elijah told the king, 'This is what God says: Because you sent messengers to ask Baal-zebub, the god of Ekron, as if there were no God in Israel to ask, you won't get up from your bed. You're going to die.' 2 Kings 1:18 - Modern Text Bible

(Elijah repeats God's judgment to Ahaziah's face, making it clear that his idolatry is the reason for his death.)