Contradiction with Genesis 9:15
God promises Noah that He will never again destroy all life with a flood, which aligns with Isaiah 54:9 stating no more flood wrath; not a contradiction.
Genesis 9:15: And I will remember my covenant, which [is] between me and you and every living creature of all flesh; and the waters shall no more become a flood to destroy all flesh.
Contradiction with Numbers 23:19
States God does not change His mind, which might contradict the notion of changing from wrath to peace in Isaiah 54:9.
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 Jeremiah 18:8
Describes God relenting from disaster if a nation repents, potentially contradicting the idea of no future wrath as in Isaiah 54:9.
Jeremiah 18:8: If that nation, against whom I have pronounced, turn from their evil, I will repent of the evil that I thought to do unto them.
Contradiction with 2 Peter 3:6-7
Mentions the world being reserved for fire judgment, which might contradict Isaiah 54:9's assurance of no further flood-like judgment.
2 Peter 3:6-7: Whereby the world that then was, being overflowed with water, perished:
Contradiction with Revelation 20:9
Indicates future fiery destruction, which could contrast with Isaiah 54:9's emphasis on no more flood wrath.
Revelation 20:9: And they went up on the breadth of the earth, and compassed the camp of the saints about, and the beloved city: and fire came down from God out of heaven, and devoured them.
Contradiction with Ezekiel 7:2-3
Warns of impending doom upon the land, which might seem to contradict the peace conveyed in Isaiah 54:9.
Ezekiel 7:2-3: Also, thou son of man, thus saith the Lord GOD unto the land of Israel; An end, the end is come upon the four corners of the land.