Contradiction with Matthew 26:52
This verse, "for all they that take the sword shall perish with the sword," suggests reliance on weapons or strength is futile, in contrast to 2 Samuel 22:3, which emphasizes relying on God as a refuge and savior from violence.
Matthew 26:52: Thinkest thou that I cannot now pray to my Father, and he shall presently give me more than twelve legions of angels?
Contradiction with Proverbs 20:22
This verse advises against seeking personal revenge: "Say not thou, I will recompense evil; but wait on the LORD, and he shall save thee," contradicting the personal defense aspect in "the God of my rock; in him will I trust: he is my shield, and the horn of my salvation, my high tower, and my refuge, my saviour; thou savest me from violence."
Proverbs 20:22: Say not thou, I will recompense evil; [but] wait on the LORD, and he shall save thee.
Contradiction with Romans 12:19
This verse commands: "avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord," which is in contradiction with relying on God as a personal savior for deliverance from enemies as stated in 2 Samuel 22:3.
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.