Contradiction with Matthew 5:44
This verse encourages love towards enemies, whereas in 1 Samuel 29:8, David is questioning being treated as an enemy.
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 Proverbs 25:21
This verse advises feeding an enemy, while 1 Samuel 29:8 shows a scenario where David doesn't want to be seen as going against his own people.
Proverbs 25:21: If thine enemy be hungry, give him bread to eat; and if he be thirsty, give him water to drink:
Contradiction with Romans 12:20
Similar to Proverbs 25:21, this verse talks about helping your enemy, in contrast to 1 Samuel 29:8, where David is seen as a potential adversary.
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 Exodus 23:4-5
These verses encourage aiding even an enemy's lost animal, whereas in 1 Samuel 29:8, the focus is on David's loyalty during a misunderstanding of enmity.
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.
Contradiction with Luke 6:27
This verse commands to do good to those who hate you, contrasting David's defensive stance in 1 Samuel 29:8.
Luke 6:27: But I say unto you which hear, Love your enemies, do good to them which hate you,