(Note: Jesus mentions Jonah actually was in the Belly of a Whale 3 Days & 3 Nights, as He will be after His Death, until His Resurrection. For all you Liberal Bible Story Changing Catholics who say Jonah did not exist – take your doubts to Jesus. He will give you His Light, on this, if you Trust Him. I believe Our Lord’s Words before, I would believe someone, who did not believe what Christ said.)
Then some of the scribes and Pharisees said to him, “Teacher, we wish to see a sign from you.”
He said to them in reply, “An evil and unfaithful generation seeks a sign, but no sign will be given it except the sign of Jonah the prophet.
Just as Jonah was in the belly of the whale three days and three nights, so will the Son of Man be in the heart of the earth three days and three nights.
At the judgment, the men of Nineveh will arise with this generation and condemn it, because they repented at the preaching of Jonah; and there is something greater than Jonah here.
At the judgment the queen of the south will arise with this generation and condemn it, because she came from the ends of the earth to hear the wisdom of Solomon; and there is something greater than Solomon here.