Jesus refuses to give a sign

^38-42 Then some of the scribes and Pharisees said, “Master, we want to see a sign from you.” But Jesus told them, “It is an evil and unfaithful generation that craves for a sign, and no sign will be given to it—except the sign of the prophet Jonah. For just as Jonah was in the belly of that great sea-monster for three days and nights, so will the Son of Man be in the heart of the earth for three days and nights. The men of Nineveh will stand up with this generation in the judgment and will condemn it. For they did repent when Jonah preached to them, and you have more than Jonah’s preaching with you now! The Queen of the South will stand up in the judgment with this generation and will condemn it. For she came from the ends of the earth to listen to the wisdom of Solomon, and you have more than the wisdom of Solomon with you now!