Contradiction with Exodus 20:3
This verse commands that no other gods should be before the Lord, which can be seen as contradictory to the notion of a contest with other gods implied in 1 Kings 18:23.
Exodus 20:3: Thou shalt have no other gods before me.
Contradiction with Deuteronomy 6:13-14
Calls for exclusive worship of God without testing or contesting Him, unlike the challenge presented in 1 Kings 18:23.
Deuteronomy 6:13-14: Thou shalt fear the LORD thy God, and serve him, and shalt swear by his name.
Contradiction with Isaiah 42:8
Asserts that God will not share His glory with another, contrasting with the idea of setting up a competitive display between deities in 1 Kings 18:23.
Isaiah 42:8: I [am] the LORD: that [is] my name: and my glory will I not give to another, neither my praise to graven images.
Contradiction with Matthew 4:7
Jesus states that one should not test God, which could be seen as contradictory to Elijah's setup for a divine test in 1 Kings 18:23.
Matthew 4:7: Jesus said unto him, It is written again, Thou shalt not tempt the Lord thy God. [tempt: or, try, or, put to trial, or, proof]
Contradiction with 2 Kings 17:35
Emphasizes making covenants to worship only God and not serve other gods, which stands in contrast to the showdown depicted in 1 Kings 18:23.
2 Kings 17:35: With whom the LORD had made a covenant, and charged them, saying, Ye shall not fear other gods, nor bow yourselves to them, nor serve them, nor sacrifice to them: