The Sign of Jonah

Then some of the Pharisees and teachers of the law
said to Him, "Teacher,
we want to see a miraculous sign from You."

He answered, "A wicked and adulterous generation
asks for a miraculous sign!
But none will be given to it
except the sign of the prophet Jonah.
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.
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 One greater than Jonah is here.
The queen of the South
will rise at the judgment with this generation
and condemn it;
for she came from the ends of the earth
to listen to Solomon's wisdom,
and now One greater than Solomon is here.

(Matthew 12:38-42)