Contradiction with Exodus 23:4-5
These verses instruct to help one's enemy, which contrasts with pronouncing judgment against enemies as in Ezekiel 25:2.
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 Matthew 5:44
This verse encourages loving and praying for enemies, opposing the idea of setting face against the Ammonites.
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
It advises feeding and giving drink to enemies, not setting one's face against them.
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
Encourages acts of kindness to enemies, contrasting the proclamation of judgment in Ezekiel 25:2.
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 James 4:11
Advises against speaking evil against another, which could be seen as contradictory to the directive to prophesy against the Ammonites.
James 4:11: Speak not evil one of another, brethren. He that speaketh evil of [his] brother, and judgeth his brother, speaketh evil of the law, and judgeth the law: but if thou judge the law, thou art not a doer of the law, but a judge.