Matthew 12:37

The good man out of his good treasure brings out good things, and the evil man out of his evil treasure brings out evil things.

I tell you that every idle word that men speak, they will give account of it in the day of judgment.

Then certain of the scribes and Pharisees answered, "Teacher, we want to see a sign from you.

But he answered them, "An evil and adulterous generation seeks after a sign, but no sign will be given it but the sign of Jonah the prophet.