Contradiction with Exodus 20:13
This verse commands "Thou shalt not kill," which contradicts the notion of killing in battle as described in Joshua 8:25.
Exodus 20:13: Thou shalt not kill.
Contradiction with Matthew 5:44
Jesus teaches to "love your enemies," opposing the idea of destroying them as in Joshua 8:25.
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 to "recompense no man evil for evil," contrasting the retribution seen in Joshua 8:25.
Romans 12:17: Recompense to no man evil for evil. Provide things honest in the sight of all men.
Paradox #1
The moral conflict in this verse could be the violence and destruction involved, as it describes the complete annihilation of a city, which can conflict with teachings about compassion and valuing human life.