Matthew 12:39-41

39But he, answering, said to them, A wicked and adulterous generation seeks after a sign, and a sign shall not be given to it save the sign of Jonas the prophet.

40For even as Jonas was in the belly of the great fish three days and three nights, thus shall the Son of man be in the heart of the earth three days and three nights.

41Ninevites shall stand up in the judgment with this generation, and shall condemn it: for they repented at the preaching of Jonas; and behold, more than Jonas [is] here.