Contradiction with Proverbs 19:5
A false witness shall not be unpunished, which contradicts with the temporary triumph of Hananiah in Jeremiah 28:12.
Proverbs 19:5: A false witness shall not be unpunished, and [he that] speaketh lies shall not escape. [unpunished: Heb. held innocent]
Contradiction with Ezekiel 13:22-23
These verses declare that false prophets will no longer have visions, contradicting Jeremiah 28:12 where a false prophet temporarily succeeds.
Ezekiel 13:22-23: Because with lies ye have made the heart of the righteous sad, whom I have not made sad; and strengthened the hands of the wicked, that he should not return from his wicked way, by promising him life: [by...: or, that I should save his life: Heb. by quickening him]
Contradiction with Deuteronomy 18:20-22
A prophet who presumes to speak a word in God's name which He has not commanded shall die, yet Hananiah falsely prophesies in Jeremiah 28:12 and initially goes unpunished.
Deuteronomy 18:20-22: But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die.
Contradiction with Matthew 7:15-20
By their fruits you will know them, contradicting the immediate context in Jeremiah 28:12 where the false prophecy seems plausible.
Matthew 7:15-20: Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
Contradiction with 1 John 4:1
This verse enjoins testing the spirits to see whether they are from God, contradicting the acceptance in Jeremiah 28:12 before God's true message is revealed.
1 John 4:1: Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.