But what comes out of the mouth proceeds from the heart, and this defiles a person. For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false witness, slander.
In Matthew, Chapter 15, the Pharisees and Scribes had come to Jesus to ask him why his disciples break the traditions of the elders by not washing their hands before they eat. Christs asks the Pharisees and Scribes why do you break the commandments of God for the sake of your traditions. Jesus sites the prophesy of Isaiah 29:13: