I assume that the book starts off by saying, "Don't bother to wash your hands before cooking, Jesus explains this is not necessary.":
M't:15:1: Then came to Jesus scribes and Pharisees, which were of Jerusalem, saying,
M't:15:2: Why do thy disciples transgress the tradition of the elders? for they wash not their hands when they eat bread.
M't:15:10: And he called the multitude, and said unto them, Hear, and understand:
M't:15:11: Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.