Contradiction with Proverbs 24:17
Celebrate not when your enemy falls, contradicting the call to celebrate in Numbers 21:27.
Proverbs 24:17: Rejoice not when thine enemy falleth, and let not thine heart be glad when he stumbleth:
Contradiction with Matthew 5:44
Love your enemies, contrasting the triumph over and destruction of foes in Numbers 21:27.
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
Avenge not yourselves, contradicting the warriors' exultation in Numbers 21:27.
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 25:21-22
Feed your enemy if he is hungry, opposite to the context of conflict in Numbers 21:27.
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 Exodus 23:4-5
Help your enemy's struggling possession, in contrast to rejoicing over their downfall in Numbers 21:27.
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.