They had forgotten to bring bread, and they had only one loaf with them in the boat.
In coming to the other side of the sea, the disciples had forgotten to bring bread.
Then he left them, got into the boat again, and went off to the other shore. The Leaven of the Pharisees.
He enjoined them, “Watch out, guard against the leaven of the Pharisees and the leaven of Herod.”