Remigius of Auxerre — as excerpted in the Catena Aurea on Matthew 15:15-20

“The Lord was used to speak in parables, so that Peter when he heard, That which entereth into the mouth defileth not a man, thought it was spoken as a parable, and asked, as it follows; Then answered Peter, and said unto him, Declare unto us this parable. And because he asked this on behalf of the rest, they are all included in the rebuke, But he said, Are ye also yet without understanding?”