Matthew 12:39 in the King James Version
But he answered and said unto them, An evil and adulterous generation seeketh after a sign; and there shall no sign be given to it, but the sign of the prophet Jonas:
Context
38 Then certain of the scribes and Pharisees answered, “Teacher, we want to see a sign from you.”
39 But he answered them, “An evil and adulterous generation seeks after a sign, but no sign will be given to it but the sign of Jonah the prophet.
40 For as Jonah was three days and three nights in the belly of the huge fish, so will the Son of Man be three days and three nights in the heart of the earth.