Contradiction with Exodus 14:14
1 Samuel 26:4 involves action being taken to gather intelligence, while in Exodus 14:14, reliance is solely on the Lord to fight for you.
Exodus 14:14: The LORD shall fight for you, and ye shall hold your peace.
Contradiction with Matthew 5:44
1 Samuel 26:4 involves seeking information on an enemy, whereas Matthew 5:44 advises to love enemies and pray for those who persecute you.
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
In 1 Samuel 26:4, David takes steps regarding dealing with Saul, but Romans 12:19 advises against personal vengeance.
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
Proverbs advises to wait for the Lord and not repay evil, whereas 1 Samuel 26:4 involves actively seeking information to confront a situation.
Proverbs 20:22: Say not thou, I will recompense evil; [but] wait on the LORD, and he shall save thee.
Contradiction with 1 Peter 3:9
It says not to repay evil with evil, whereas 1 Samuel 26:4 shows a proactive approach to a conflict situation.
1 Peter 3:9: Not rendering evil for evil, or railing for railing: but contrariwise blessing; knowing that ye are thereunto called, that ye should inherit a blessing.
Contradiction with James 1:20
Human anger does not accomplish God's righteousness, yet 1 Samuel 26:4 is part of an approach involving confrontation.
James 1:20: For the wrath of man worketh not the righteousness of God.
Contradiction with Proverbs 3:5
Advises trust in the Lord rather than leaning on your own understanding, whereas 1 Samuel 26:4 involves personal strategy and action.
Proverbs 3:5: Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Contradiction with Joshua 1:9
Focuses on being strong and courageous with reliance on God's presence, contrasting with the human strategy evident in 1 Samuel 26:4.
Joshua 1:9: Have not I commanded thee? Be strong and of a good courage; be not afraid, neither be thou dismayed: for the LORD thy God [is] with thee whithersoever thou goest.