Contradiction with Deuteronomy 20:16-17
Contradicts by commanding the Israelites to destroy all inhabitants of certain cities, while 1 Samuel 30:17 highlights the sparing of some Amalekites.
Deuteronomy 20:16-17: But of the cities of these people, which the LORD thy God doth give thee [for] an inheritance, thou shalt save alive nothing that breatheth:
Contradiction with Matthew 5:44
Contradicts by instructing to love enemies and pray for those who persecute you, whereas 1 Samuel 30:17 depicts David attacking the Amalekites.
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 Exodus 20:13
Contradicts with the commandment "Thou shalt not kill," whilst 1 Samuel 30:17 involves killing the Amalekites.
Exodus 20:13: Thou shalt not kill.
Contradiction with Romans 12:19
Contradicts by advising not to take vengeance, whereas 1 Samuel 30:17 involves exacting vengeance on the Amalekites.
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 24:17
Contradicts by advising not to rejoice when your enemy falls, while 1 Samuel 30:17 describes the defeat of the Amalekites.
Proverbs 24:17: Rejoice not when thine enemy falleth, and let not thine heart be glad when he stumbleth: