Take heed. Look well. Greek. horao. App-133.
beware of the leaven. Figure of speech Hypocatastasis. leaven put by implication for "doctrine" (Matthew 16:12), because of its evil effects. Compare notes on Matthew 15:26, and Matthew 13:33.
beware. pay attention to, so as to be careful of.
of. from. Here, away from: i.e. beware [and keep] away from, or keep clear of, as in Matthew 7:15. Greek. apo. App-104.
leaven. See note on Matthew 13:33.