Mark 8:13-16

And He left them, and getting into the boat again, departed to the other side. Now the disciples had forgotten to take bread, and they did not have more than one loaf with them in the boat. Then He charged them, saying, “Take heed, beware of the leaven of the Pharisees and the leaven of Herod.” And they reasoned among themselves, saying, “It is because we have no bread.”