Contradiction with Mark 7:15
Mark 7:15 contradicts Numbers 19:8 by implying that external things do not defile a person spiritually, whereas Numbers 19:8 emphasizes physical defilement from external contact.
Mark 7:15: If any man have ears to hear, let him hear.
Contradiction with Acts 10:15
Acts 10:15 contradicts Numbers 19:8 by stating that what God has cleansed should not be considered unclean, in contrast to the ceremonial defilement described in Numbers 19:8.
Acts 10:15: And the voice [spake] unto him again the second time, What God hath cleansed, [that] call not thou common.
Contradiction with Matthew 15:11
Matthew 15:11 opposes the idea of Numbers 19:8 by asserting that what enters the mouth does not defile a person, differing from the external defilement concern in Numbers 19:8.
Matthew 15:11: Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.