Contradiction with Exodus 20:13
This verse states "Thou shalt not kill," contradicting the conquest narratives in Deuteronomy 4:46 which involve the Israelites killing inhabitants of the lands they conquer.
Exodus 20:13: Thou shalt not kill.
Contradiction with Matthew 5:44
Jesus commands to "love your enemies" and "pray for those who persecute you," which can contrast with the conquests and battles depicted in Deuteronomy.
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
Advises not to take revenge, leaving room for God's wrath, which contrasts with the Israelites' direct actions in battle as seen in Deuteronomy 4:46.
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.