The Sign of Jonah

³⁸ Then some of the Pharisees and teachers of the law said to him, “Teacher, we want to see a sign from you.”

³⁹ He answered, “A wicked and adulterous generation asks for a sign! But none will be given it except the sign of the prophet Jonah. ⁴⁰ For as Jonah was three days and three nights in the belly of a huge fish, so the Son of Man will be three days and three nights in the heart of the earth. ⁴¹ The men of Nineveh will stand up at the judgment with this generation and condemn it; for they repented at the preaching of Jonah, and now something greater than Jonah is here.

Matthew 12:38-41 NIV