Mark 8:13

Immediately he entered into the boat with his disciples and came into the region of Dalmanutha.

The Pharisees came out and began to question him, seeking from him a sign from heaven and testing him.

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.”

They forgot to take bread; and they didn’t have more than one loaf in the boat with them.

He warned them, saying, “Take heed: beware of the yeast of the Pharisees and the yeast of Herod.”

They reasoned with one another, saying, “It’s because we have no bread.”