Contradiction with Matthew 5:44
Contradicts the notion of vengeance in 2 Samuel 2:2 by encouraging love and forgiveness towards enemies.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Contradiction with Romans 12:19
Contradicts the idea of seeking personal justice or vengeance found in the context around 2 Samuel 2:2 by instructing believers to leave vengeance to God.
Romans 12:19: Dearly beloved, avenge not yourselves, but [rather] give place unto wrath: for it is written, Vengeance [is] mine; I will repay, saith the Lord.
Contradiction with Proverbs 20:22
Contradicts the actions leading up to 2 Samuel 2:2 by advising against repaying evil with evil and encouraging waiting for the Lord's deliverance.
Proverbs 20:22: Say not thou, I will recompense evil; [but] wait on the LORD, and he shall save thee.
Contradiction with Exodus 14:14
Contradicts the human-driven actions in 2 Samuel 2:2 by suggesting to remain still and let God fight the battle.
Exodus 14:14: The LORD shall fight for you, and ye shall hold your peace.