according to mark 7:1-23
7:1-5 - And now Jesus was approached by the Pharisees and some of the scribes who had come from Jerusalem. They had noticed that his disciples ate their meals with "common" hands - meaning that they had not gone through a ceremonial washing. (The Pharisees, and indeed all the Jews, will never eat unless they have washed their hands in a particular way, following a traditional rule. And they will not eat anything bought in the market until they have first performed their "sprinkling". And there are many other things which they consider important, concerned with the washing of cups, jugs and basins.) So the Pharisees and the scribes put this question to Jesus, "Why do your disciples refuse to follow the ancient tradition, and eat their bread with 'common' hands?"
7:6-8 - Jesus replied, "You hypocrites, Isaiah described you beautifully when he wrote - 'This people honours me with their lips, but their heart is far from me. And in vain they worship me, teaching as doctrines the commandments of men'. You are so busy holding on to the traditions of men that you let go the commandment of God!"
7:9-13 - Then he went on, "It is wonderful to see how you can set aside the commandment of God to preserve your own tradition! For Moses said, 'Honour your father and your mother' and 'He who curses father or mother, let him be put to death'. But you say, 'if a man says to his father or his mother, Korban - meaning, I have given God whatever duty I owed to you', then he need not lift a finger any longer for his father or mother, so making the word of God invalid for the sake of the tradition which you hold. And this is typical of much of what you do."
7:14-15 - Then he called the crowd close to him again, and spoke to them, "Listen to me now, all of you, and understand this, There is nothing outside a man which can enter into him and make him 'common'. It is the things which come out of a man that make him 'common'!"
7:17 - Later, when he had gone indoors away from the crowd, his disciples asked him about this parable.
7:18-23 - "Oh, are you as dull as they are?" he said. "Can't you see that anything that goes into a man from outside cannot make him 'common' or unclean? You see, it doesn't go into his heart, but into his stomach, and passes out of the body altogether, so that all food is clean enough. But," he went on, "whatever comes out of a man, that is what makes a man 'common' or unclean. For it is from inside, from men's hearts and minds, that evil thoughts arise - lust, theft, murder, adultery, greed, wickedness, deceit, sensuality, envy, slander, arrogance and folly! All these evil things come from inside a man and make him unclean!"