The Pharisees came and began to argue with him, asking him for a sign from heaven, to test him. And he sighed deeply in his spirit and said, “Why does this generation ask for a sign? Truly I tell you, no sign will be given to this generation.” And he left them, and getting into the boat again, he went across to the other side. Now the disciples had forgotten to bring any bread; and they had only one loaf with them in the boat. And he cautioned them, saying, “Watch out—beware of the yeast...