Final answer:
Jesus referred to Jonah as the prophet who would be a sign to the Pharisees, paralleling Jonah's three days inside the fish to Jesus' resurrection after three days.
Step-by-step explanation:
The prophet Jesus said would give the Pharisees a sign is Jonah. In the Gospel according to Matthew, Jesus references the Sign of Jonah, which is a message of warning and an insistence on repentance. Jesus indicates that just as Jonah was a sign to the Ninevites, so will the Son of Man be to this generation. The sign refers to Jonah's three days in the belly of the great fish, prefiguring Jesus’ own resurrection after three days.