Matthew 12:38-41

Then some of the scribes and Pharisees said to him, “Teacher, we want to see a sign from you.” He answered them, “An evil and adulterous generation demands a sign, but no sign will be given to it except the sign of the prophet Jonah. For as Jonah was in the belly of the huge fish three days and three nights, so the Son of Man will be in the heart of the earth three days and three nights. The men of Nineveh will stand up at the judgment with this generation and condemn it, because they repented at Jonah’s preaching; and look — something greater than Jonah is here.