Contradiction with Matthew 5:44
Numbers 33:50 speaks of possessing the land, while Matthew 5:44 teaches love for enemies and non-violence.
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 Exodus 20:13
Numbers 33:50 commands the conquest of land necessitating conflict, whereas Exodus 20:13 prohibits killing.
Exodus 20:13: Thou shalt not kill.