Mark 8:13-16

Then he turned and left them, got back into the boat, and crossed over to the opposite shore. Now, the disciples had forgotten to take bread with them, except for one loaf of flatbread. And as they were sailing across the lake, Jesus repeatedly warned them, “Be on your guard against the yeast inside of the Pharisees and the yeast inside of Herod!” But the disciples had no clue what Jesus was talking about, so they began to discuss it among themselves, saying, “Is he saying this because we forgot to bring bread?”