Contradiction with John 3:16
It speaks of God's love and salvation for all the world, whereas Isaiah 7:18 depicts a scenario of desolation and destruction from God's command.
John 3:16: For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
Contradiction with Jonah 3:10
Describes God relenting from sending disaster upon repentance, contradicting the inevitability of destruction suggested in Isaiah 7:18.
Jonah 3:10: And God saw their works, that they turned from their evil way; and God repented of the evil, that he had said that he would do unto them; and he did [it] not.
Contradiction with Numbers 23:19
States that God does not change His mind, contradicting the idea of God commanding something negative as in Isaiah 7:18, possibly implying change.
Numbers 23:19: God [is] not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do [it]? or hath he spoken, and shall he not make it good?
Contradiction with James 1:13
Claims God cannot be tempted by evil nor does He tempt anyone, which contradicts the act of causing devastation as mentioned in Isaiah 7:18.
James 1:13: Let no man say when he is tempted, I am tempted of God: for God cannot be tempted with evil, neither tempteth he any man: [evil: or, evils]
Contradiction with 1 John 4:8
Emphasizes that God is love, posing a contradiction to the malevolent forces set loose by God in Isaiah 7:18.
1 John 4:8: He that loveth not knoweth not God; for God is love.