Matthew 12:34-36

34 O generation of vipers, how can you, being evil, speak good things? For out of the abundance of the heart the mouth speaks.

35 A good man out of the good treasure of his heart brings forth good things. And an evil man out of the evil treasure brings forth evil things.

36 But I say to you that for every idle word that men speak, they will give an account on the Day of Judgment.