Contradiction with Numbers 23:19
Contradicts because it states that God does not change His mind or lie, whereas Jeremiah 18:9 suggests God may change His plans based on a nation's actions.
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 1:17
Contradicts because it describes God as unchanging, while Jeremiah 18:9 implies God may alter His plans depending on human behavior.
James 1:17: Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning.
Contradiction with Malachi 3:6
Contradicts because it asserts that God does not change, in opposition to Jeremiah 18:9's implication that God may change His mind about nations.
Malachi 3:6: For I [am] the LORD, I change not; therefore ye sons of Jacob are not consumed.