Contradiction with 2 Kings 17:15
This verse states that the people rejected God's statutes and His covenant, whereas 2 Samuel 3:21 involves an agreement and covenant being formed.
2 Kings 17:15: And they rejected his statutes, and his covenant that he made with their fathers, and his testimonies which he testified against them; and they followed vanity, and became vain, and went after the heathen that [were] round about them, [concerning] whom the LORD had charged them, that they should not do like them.
Contradiction with Acts 5:29
This verse emphasizes obeying God rather than men, which contrasts with 2 Samuel 3:21 where human agreements are prioritized.
Acts 5:29: Then Peter and the [other] apostles answered and said, We ought to obey God rather than men.
Contradiction with Isaiah 31:1
It warns against relying on human alliances instead of seeking the Lord, in contrast to the agreement between David and Abner in 2 Samuel 3:21.
Isaiah 31:1: Woe to them that go down to Egypt for help; and stay on horses, and trust in chariots, because [they are] many; and in horsemen, because they are very strong; but they look not unto the Holy One of Israel, neither seek the LORD!
Contradiction with Jeremiah 17:5
This verse curses reliance on man rather than God, conflicting with the agreement made in 2 Samuel 3:21.
Jeremiah 17:5: Thus saith the LORD; Cursed [be] the man that trusteth in man, and maketh flesh his arm, and whose heart departeth from the LORD.
Contradiction with Psalm 146:3
Advises not to put trust in princes, while 2 Samuel 3:21 involves trusting Abner to bring Israel to David.
Psalm 146:3: Put not your trust in princes, [nor] in the son of man, in whom [there is] no help. [help: or, salvation]