The God that answereth by fire - God had frequently before consumed offerings with supernatural fire Leviticus 9:24; Judges 6:21. The Baal-worshippers were no doubt in the habit of attributing thunder and lightning to their gods - the great Nature-power - and thus had no excuse for declining Elijah’s challenge.
Related Commentaries of 1 Kings 18:24
1 Kings 18:24
24 And call ye on the name of your gods, and I will call on the name of the LORD: and the God that answereth by fire, let him be God. And all the people answered and said, It is well spoken.