Contradiction with 1 Samuel 15:29
This verse declares that God does not lie or change His mind, which contradicts any implication that He might in Numbers 23:16.
1 Samuel 15:29: And also the Strength of Israel will not lie nor repent: for he [is] not a man, that he should repent. [Strength: or, Eternity, or, Victory]
Contradiction with Exodus 32:14
This verse states that the Lord repented of the evil He thought to do unto His people, contradicting the idea of God being unchangeable in Numbers 23:16.
Exodus 32:14: And the LORD repented of the evil which he thought to do unto his people.
Contradiction with James 1:17
This verse describes God as having no variableness, contradicting any suggestion of changeability in God's actions or words in Numbers 23:16.
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 Jonah 3:10
This verse describes God changing His mind about the calamity He planned for Nineveh, contradicting the notion of God's unchanging decree in Numbers 23:16.
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 Hebrews 6:18
This verse asserts that it is impossible for God to lie, contrasting any suggestion in Numbers 23:16 that could be interpreted otherwise.
Hebrews 6:18: That by two immutable things, in which [it was] impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us: