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 belly of the great fish so shall the Son of man be three days and three nights in the heart of the earth.