38 Then certain of the scribes and of the Pharisees answered, saying, Master, we would see a sign from thee.
39 But he answered and said to them, An evil and adulterous generation seeketh for a sign, and there shall no sign be given to it, but the sign of the prophet Jonah.
40 For as Jonah was three days and three nights in the whale's belly: so shall the Son of man be three days and three nights in the heart of the earth.