1 Kings 18:24

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. Since sacrifice was the chief expression of worship at that time, this form of deciding the issue was chosen, and since the priests of Baal were given the first opportunity to test the truth of their religion and also their choice of bullocks, it was practically impossible for them to refuse without immediately branding their religion as a huge fraud. And all the people answered and said, It is well spoken. The proposal and the test seemed altogether fair to them.