Matthew 12:30-40

30 Whoever is not with me is against me, and whoever does not gather with me scatters.
31 Therefore I tell you, people will be forgiven for every sin and blasphemy, but blasphemy against the Spirit will not be forgiven.
32 Whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come.
33 "Either make the tree good, and its fruit good; or make the tree bad, and its fruit bad; for the tree is known by its fruit.
34 You brood of vipers! How can you speak good things, when you are evil? For out of the abundance of the heart the mouth speaks.
35 The good person brings good things out of a good treasure, and the evil person brings evil things out of an evil treasure.
36 I tell you, on the day of judgment you will have to give an account for every careless word you utter;
37 for by your words you will be justified, and by your words you will be condemned."
38 Then some of the scribes and Pharisees said to him, "Teacher, we wish to see a sign from you."
39 But he answered them, "An evil and adulterous generation asks for a sign, but no sign will be given to it except the sign of the prophet Jonah.
40 For just as Jonah was three days and three nights in the belly of the sea monster, so for three days and three nights the Son of Man will be in the heart of the earth.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.