“Watch out for the yeast of the Pharisees” Jesus warned the disciples of the yeast of the Pharisees – Jesus was referring to the influence & teaching of the Pharisees (Matt. 16:12). A small amount of yeast can affect a large amount of bread dough when they are mixed. Yeast was a common Jewish metaphor for an invisible, pervasive influence. It often, as here, connoted a corrupting influence. The destructive nature of false teaching is warned against all through scripture! It will be the influence of these teachers that turn a crowd that praised Jesus to cry “crucify him!” Personally I get very angry about false teaching, it can be so destructive. What do you think?