Matthew 12:38-42

Then some of the scribes and Pharisees said to Him, “Teacher, we want to see a sign (attesting miracle) from You [proving that You are what You claim to be].” But He replied and said to them, “An evil and adulterous generation [that is morally unfaithful to God] craves and demands a [miraculous] sign; but no sign will be given to it except the sign of the prophet Jonah; [Luke 11:29-32] for just as JONAH WAS THREE DAYS AND THREE NIGHTS IN THE BELLY OF THE SEA MONSTER, so will the Son of Man be three days and three nights in the heart of the earth. [Jon 1:17] The men of Nineveh will stand up [as witnesses]at the judgment against this generation, and will condemn it because they repented at the preaching of Jonah; and now, something greater than Jonah is here. [Jon 3:5] The Queen of the South (Sheba) will stand up [as a witness]at the judgment against this generation, and will condemn it because she came from the ends of the earth to listen to the wisdom of Solomon; and now, something greater than Solomon is here. [1 Kin 10:1; 2 Chr 9:1]