38 Then certain of the scribes and of the Pharisees answered, saying, Teacher, we would see a sign from you.
39 But he answered and said unto them, An evil and adulterous generation seeks after 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.