Mark 7:14-23

And he called the people to him again and said to them, “Hear me, all of you, and understand: There is nothing outside a person that by going into him can defile him, but the things that come out of a person are what defile him.” And when he had entered the house and left the people, his disciples asked him about the parable. And he said to them, “Then are you also without understanding? Do you not see that whatever goes into a person from outside cannot defile him, since it enters not his heart but his stomach, and is expelled? (Thus he declared all foods clean.) And he said, “What comes out of a person is what defiles him. For from within, out of the heart of man, come evil thoughts, sexual immorality, theft, murder, adultery, coveting, wickedness, deceit, sensuality, envy, slander, pride, foolishness. All these evil things come from within, and they defile a person.”

What a man evacuates when squatting in the toilet is dirty, not the incoming food that he eats. In a similar manner all the bad things which a man gives birth to from his heart, it is these which make him or her dirty.

To wash dirty hands before eating is healthy; but keeping the Pharisees’ complicated washing and diet rules do not make anyone a clean person.