Matthew 12:34-40

But you who are known as the Pharisees are rotten to the core like venomous snakes. How can your words be good if you are rotten within? For what has been stored up in your hearts will be heard in the overflow of your words! “When virtue is stored within, the hearts of good, upright people will produce good fruit. But when evil is hidden within, those who are evil will produce evil fruit. You can be sure of this: when the day of judgment comes, everyone will be held accountable for every careless word he has spoken. Your very words will be used as evidence, and your words will declare you either innocent or guilty.” Then a few Jewish scholars and Pharisees spoke up and said, “Teacher, why don’t you perform a miraculous sign for us.” Jesus replied, “Only evil people who are unfaithful to God would demand a sign. There will be no sign given to you except the sign of the prophet Jonah. For as Jonah was in the belly of the huge sea creature for three days and three nights, so the Son of Man will be in the heart of the earth for three days and three nights.