Mark 8:11-13 - Pharisees Demand A Sign
11 The Pharisees came out and began to question him, seeking from him a sign from heaven, and testing him. 12 He sighed deeply in his spirit, and said, "Why does this generation seek a sign? Most certainly I tell you, no sign will be given to this generation." 13 He left them, and again entering into the boat, departed to the other side.