Contradiction with Matthew 5:39
Contradicts the principle of retribution found in 1 Kings 2:3 with the teaching to "turn the other cheek."
Matthew 5:39: But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
Contradiction with Romans 12:19
Opposes taking personal vengeance as implied by the acts of obedience to God's statutes in 1 Kings 2:3.
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.
Contradiction with Luke 6:27-29
Teaches loving enemies and not "keeping the charge" against them as suggested in 1 Kings 2:3.
Luke 6:27-29: But I say unto you which hear, Love your enemies, do good to them which hate you,
Contradiction with Matthew 5:44
Encourages loving and praying for enemies, challenging the strict adherence to being strong and courageous in warfare implied by 1 Kings 2:3.
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 James 2:10
Shows that keeping the law perfectly, as 1 Kings 2:3 may suggest, is impossible, thereby contradicting the idea of complete obedience.
James 2:10: For whosoever shall keep the whole law, and yet offend in one [point], he is guilty of all.
Contradiction with Galatians 3:10
Argues against being under the law as a curse, opposed to the blessing implied in 1 Kings 2:3 for keeping the law.
Galatians 3:10: For as many as are of the works of the law are under the curse: for it is written, Cursed [is] every one that continueth not in all things which are written in the book of the law to do them.