Thematic Bible: What proceeds from the heart

Then Jesus called the crowds to come to Him, and He said to them, "Listen and understand. It is not what enters the mouth of a person that [spiritually] corrupts him, but what proceeds out of his mouth that [spiritually] corrupts him."

Then He called the crowd to Him again and said to them, "Listen to me, all of you, and understand [what I am saying]. There is nothing that enters a person's body from the outside that can [spiritually] corrupt him, but it is what proceeds out of a person's life that [spiritually] corrupts him." {{Verse is absent from most ancient manuscripts}}. read more.
And when He had gone into the house away from the crowd His disciples asked Him about this parable. He said to them, "Are you also as lacking in understanding [as the others]? Do you not understand that whatever enters a person's body from the outside cannot [spiritually] corrupt him? It is because it does not go into his heart, but into his stomach, and [eventually] passes out into the toilet." By saying this He made all foods [ceremonially] acceptable. And He said, "Whatever proceeds out of a man's life is what [spiritually] corrupts him. For from within, out of people's hearts, proceed evil thoughts, sexual immorality, stealing, murder, extramarital affairs, greedy desires, wickedness, deceit, unrestrained indecency, envy, slander, arrogance and foolishness. All these evil things proceed from within [man's heart] and [spiritually] corrupt him."