Contradiction with Matthew 5:44
Nehemiah 4:22 implies taking precautions against adversaries, whereas Matthew 5:44 teaches to love and pray for enemies.
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 25:21-22
Nehemiah 4:22 suggests defense and preparedness against foes, while Proverbs 25:21-22 suggests feeding and showing kindness to enemies.
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 Romans 12:19
Nehemiah 4:22 emphasizes readiness to guard against threats, whereas Romans 12:19 advises against personal vengeance, leaving it to God's wrath.
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.