Mark 8:11-13

As soon as Jesus landed, he was confronted by the Pharisees, who argued with Jesus and tested him. They demanded that he give them a miraculous sign from heaven. With a deep sigh from his spirit, he said, “What drives this generation to clamor for a sign? Listen to the truth: there will absolutely be no sign given to this generation!” Then he turned and left them, got back into the boat, and crossed over to the opposite shore.