Matthew 12:39
But he answered them: an evil and adulterous generation seeks for a sign, but no sign will be given to it except the sign of the prophet Jonah. The evil and adulterous generation designation applies to the sign-seekers the same assessment applied to the Beelzebul accusers: the heart that is evil and adulterous (unfaithful to the covenant) is the heart that demands signs rather than responding to what has already been given. The only sign is the sign of Jonah — which the next verse identifies as the resurrection.