Irenaeus Against Heresies Book IV because after the manner of these animals they go about in subtilty, and injure others. For He said, "Beware of the leaven of the Pharisees and of the Sadducees."[645] Origen Commentary on Matthew Book XII from running back to carnal things, Jesus said to them when on the other side, "Take heed and beware."[35] And something like this was what they said, "If we had loaves we would not have had to take of the leaven of the Pharisees and the Sadducees; but since, from want of loaves, we run the risk of taking from their leaven, while the Saviour does not wish us to run back to their teaching, therefore He said to us, "Take heed and beware of the leaven of the Pharisees and the Sadducees."[41] "[42] But since the disciples understood, when Jesus said, "Beware of the leaven,"[47]