Contradiction with 1 Samuel 8:7
This verse shows God's warning against having a human king, as opposed to the focus in 1 Kings 12:21 on assembling an army under a king's command.
1 Samuel 8:7: And the LORD said unto Samuel, Hearken unto the voice of the people in all that they say unto thee: for they have not rejected thee, but they have rejected me, that I should not reign over them.
Contradiction with Matthew 5:9
This verse blesses peacemakers, contrasting with 1 Kings 12:21, where Rehoboam prepares for war.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Romans 12:18
Advocates for peace with all men, contradicting the war preparation in 1 Kings 12:21.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.
Contradiction with James 3:17
Describes wisdom as peaceable and gentle, opposing the warlike intention in 1 Kings 12:21.
James 3:17: But the wisdom that is from above is first pure, then peaceable, gentle, [and] easy to be intreated, full of mercy and good fruits, without partiality, and without hypocrisy. [partiality: or, wrangling]
Contradiction with 1 Kings 11:11-13
God’s declaration that the kingdom will be taken from Solomon’s house for his disobedience contradicts Rehoboam's attempt to regain control through military force in 1 Kings 12:21.
1 Kings 11:11-13: Wherefore the LORD said unto Solomon, Forasmuch as this is done of thee, and thou hast not kept my covenant and my statutes, which I have commanded thee, I will surely rend the kingdom from thee, and will give it to thy servant. [is done...: Heb. is with thee]