Mark 7:14-15, 17-19

And when he had called all the people unto him, he said unto them, Hearken unto me every one of you, and understand: there is nothing from without a man, that entering into him can defile him: but the things which come out of him, those are they that defile the man.

And when he was entered into the house from the people, his disciples asked him concerning the parable. And he saith unto them, Are ye so without understanding also? Do ye not perceive, that whatsoever thing from without entereth into the man, it cannot defile him; because it entereth not into his heart, but into the belly, and goeth out into the draught, purging all meats?