Mark 8:11-13 - Pharisees Demand A Sign
11 And the Pharisees came and began to argue with him, demanding from him a sign from heaven [in order to] test him. 12 And sighing deeply in his spirit, he said, "Why does this generation demand a sign? Truly I say to you, no sign will be given to this generation!" 13 And he left them, got into [the boat] again, [and] went to the other side.