Matthew 12:38 in the King James Version
Then certain of the scribes and of the Pharisees answered, saying, Master, we would see a sign from thee.
Context
37 For by your words you will be justified, and by your words you will be condemned.”
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.