John Chrysostom — as excerpted in the Catena Aurea on Matthew 15:12-14

“Christ does not remove the stumblingblock out of the way of the Pharisees, but rather rebukes them; as it follows, But he answered and said, Every plant which my heavenly Father has not planted shall be rooted up. This Manichæus affirmed was spoken of the Law, but what has been already said is a sufficient refutation of this. For if He had said this of the Law, how would He have above contended for the Law, saying, Why transgress ye the commandment of God through your tradition? Or would He have cited the Prophet? Or how, if God said, Honour thy father and thy mother, is not this, being spoken in the Law, a plant of God?”