1 Kings 18:24 - Wesley's Explanatory Notes

By Fire — That shall consume the sacrifice by fire sent from heaven; which the people knew the true God used to do. It was a great condescension in God, that he would permit Baal to be a competitor with him. But thus God would have every mouth to be stopped, and all flesh become silent before him. And Elijah doubtless had a special commission from God, or he durst not have put it to this issue. But the case was extraordinary, and the judgment upon it would be of use not only then, but in all ages. Elijah does not say, The God that answers by water, tho' that was the thing the country needed, but that answers by fire, let him be God; because the atonement was to be made, before the judgment could be removed. The God therefore that has power to pardon sin, and to signify that by consuming the sin — offering, must needs be the God that can relieve us against the calamity.