Then understood they that he bade them not beware of the leaven of bread, but of the doctrine of the Pharisees and of the Sadducees.
All Commentaries on Matthew 16:12 Go To Matthew 16
Jerome
AD 420
For he that takes heed of the leaven of the Pharisees and the Sadducees, does not observe the precepts of the Law and of the letter, and neglects the traditions of men that he may do the commandments of God. This is the leaven of which the Apostle speaks, “A little leaven leaveneth the whole lump.” By every means also we should avoid that leaven which Marcion, Valentinus, and all the heretics had. For the nature of leaven is such, that when mixed with flour, that which seemed a little increases to a large quantity, and brings the whole mixture to its own flavour. Thus heretical doctrine if it have cast but a small spark into your breast, ina short time a mighty flame is raised, and drives the whole temper of the man along with it.
How had they no bread, seeing that as soon as they had filled seven baskets they entered into the boat, and came into the parts of Magedan? There they hear that they ought to take heed of the leaven of the Pharisees and Sadducees. Butthe Scripture is witness that they had forgotten to take the baskets with them.
Thus He takes this occasion to instruct them what is meant by the five loaves and the seven loaves, the five thousand and the four thousand, who were fed in the desert. For if the leaven of the Pharisees and Sadducees signified notearthly food, but corrupt traditions and heretical dogmas, why should not the food with which the people of God is nourished signify the true and uncorrupt doctrine?
