Elijah approached to all the people and said, “How long will you go limping over two opinions? If Yahweh is God, go after him; but if Baal, go after him.” But the people did not answer him a word.” (1 Kings 18:21, LEB)

Elijah speaks to the Israelites on Mt. Carmel in the titanic struggle between God and [so-called] Baal.

The Israelites had been so affected by worship to Baal and to the various so-called gods under him, that they did not know who was the true God: Yahweh, the God of Israel or Baal? Elijah puts it colorfully here, “How long will you go limping between two opinions?”

It would not be much longer before they had a clear and spectacular demonstration of who exactly was the true God [Here is a hint, dear reader, it was not Baal].

The Orthodox Study Bible comments:

The people were indecisive about the true God, and their double-mindedness was destroying their souls. Is the true God Baal or the Lord? Baal was the name of a presiding deity in a community of deities; therefore, the worship of Baal included that of many gods. But if the presiding deity were overcome, so would all the rest be. The people would soon discover anew that the Lord is the one true God.

When fire comes down from a clear sky without any clouds and consumes the altar that Elijah has built and the water on the altar and the sacrifice, the people will shout out: “Yahweh, He is the God!  Yahweh, He is the God!” And so He is.