Mat 16:12. Συνῆκαν, they understood) Our Lord still left something to be understood by His disciples. He shows them what leaven did not mean in this passage; it was their part, when they heard what it was not, to gather what it must be. Thus also in ch. Mat 17:13.-ἀπὸ τὴς διδακῆς, from that of the doctrine)[726] sc. from the leaven of the doctrine.[727] The word doctrine, in opposition to bread, is taken in a wide signification, so as to mean even hypocrisy. The leaven was this hypocritical doctrine.
[726] In E. V. the verse is rendered, “Then understood they how that He bade them not beware of the leaven of bread, but of the doctrine of the Pharisees and of the Sadducees.”-(I. B.)
[727] Of which a specimen occurs in Mat 16:1.-V. g.