Contradiction with 1 Kings 12:24
Whereas 2 Kings 3:6 discusses Jehoram's call to war, 1 Kings 12:24 commands refraining from battling against Israelite brothers.
1 Kings 12:24: Thus saith the LORD, Ye shall not go up, nor fight against your brethren the children of Israel: return every man to his house; for this thing is from me. They hearkened therefore to the word of the LORD, and returned to depart, according to the word of the LORD.
Contradiction with Matthew 5:9
2 Kings 3:6 involves preparations for war, while Matthew 5:9 blesses peacemakers.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with James 3:18
This verse describes the fruit of righteousness sown in peace, contrasting with the warlike preparations indicated in 2 Kings 3:6.
James 3:18: And the fruit of righteousness is sown in peace of them that make peace.