Beware of the Yeast of the Pharisees and Sadducees

When they went across the lake, the disciples forgot to take bread. Jesus said to them, be on your guard against the yeast of the pharisees and sadducees. Brent: What is matthew's agenda? The mums are there. They are not taking care of the outcast. So jesus says, beware of the yeast. Or i believe wha he's saying is beware of the sin of the phArisees. O sin.