Luke 11:29-30

29Now as the crowds were increasing [in number], He began to say, “This [present] generation is a wicked generation; it seeks a sign (attesting miracle), but no sign will be given to it except the sign of Jonah [the prophet].

30For just as Jonah became a sign to the people of Nineveh, so will the Son of Man also be [a sign] to this generation.