Contradiction with Jeremiah 18:7-10
This passage explains that God may change His mind about doing good or harm to a nation based on their actions, potentially contradicting the idea of performing the counsel of His messengers unconditionally.
Jeremiah 18:7-10: [At what] instant I shall speak concerning a nation, and concerning a kingdom, to pluck up, and to pull down, and to destroy [it];
Contradiction with Jonah 3:10
God saw the works of the people of Nineveh, repented of the evil He said He would do unto them, and did it not, showing that He can change His declared plans, unlike the firm declaration in Isaiah 44:26.
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
This verse states that God does not lie or change His mind, which contrasts with instances where God appears to alter His intended plans in response to human actions, as seen in Isaiah 44:26.
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?