The yeast of the Pharisees – Jesus warns the disciples to be wary of Pharisees’ teachings (Matthew 16:5 – 16:12).
When Jesus and the disciples went across the Sea of Galilee, they forgot to take bread with them. Jesus told them, “Be careful. Be on your guard against the yeast of the Pharisees and Sadducees.” The disciples discussed this among themselves. They assumed Jesus told them this because they had forgotten to bring bread on their trip.