Matthew 12:34-35
12:34 Offspring of vipers! How are you able to say anything good, since you are evil? For the mouth speaks from what fills the heart.
12:35 The good person brings good things out of his good treasury, and the evil person brings evil things out of his evil treasury.
Matthew 15:19-20
15:19 For out of the heart come evil ideas, murder, adultery, sexual immorality, theft, false testimony, slander.
15:20 These are the things that defile a person; it is not eating with unwashed hands that defiles a person.”
Mark 7:21-23
7:21 For from within, out of the human heart, come evil ideas, sexual immorality, theft, murder,
7:22 adultery, greed, evil, deceit, debauchery, envy, slander, pride, and folly.
7:23 All these evils come from within and defile a person.”