Contradiction with Proverbs 15:1
A gentle answer turns away wrath, whereas 1 Samuel 17:44 presents a harsh and threatening statement.
Proverbs 15:1: A soft answer turneth away wrath: but grievous words stir up anger.
Contradiction with Matthew 5:44
Encourages loving your enemies and praying for them, contrary to the threats made in 1 Samuel 17:44.
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 12:20
Advises feeding your enemy if he is hungry, opposite to the hostile intent in 1 Samuel 17:44.
Romans 12:20: Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head.
Contradiction with Proverbs 25:21-22
Suggests showing kindness to enemies, unlike the aggressive confrontation in 1 Samuel 17:44.
Proverbs 25:21-22: If thine enemy be hungry, give him bread to eat; and if he be thirsty, give him water to drink:
Contradiction with Exodus 23:4-5
Commands helping your enemy if in difficulty, which contrasts with the aggression in 1 Samuel 17:44.
Exodus 23:4-5: If thou meet thine enemy's ox or his ass going astray, thou shalt surely bring it back to him again.