Contradiction with Exodus 20:13
This verse commands not to kill, contradicting Joshua 8:3's involvement in a military campaign.
Exodus 20:13: Thou shalt not kill.
Contradiction with Matthew 5:9
Promotes peacemaking, which contradicts the act of warfare in Joshua 8:3.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Matthew 5:44
Encourages love for enemies, opposing the combat actions in Joshua 8:3.
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 12:17
Advises not to repay evil for evil, clashing with the retributive nature of Joshua 8:3.
Romans 12:17: Recompense to no man evil for evil. Provide things honest in the sight of all men.
Contradiction with Isaiah 2:4
Foretells an end to warfare, contrary to the military action in Joshua 8:3.
Isaiah 2:4: And he shall judge among the nations, and shall rebuke many people: and they shall beat their swords into plowshares, and their spears into pruninghooks: nation shall not lift up sword against nation, neither shall they learn war any more. [pruninghooks: or, scythes]