Because it entereth not into his heart, but into the belly, and goeth out into the draught, purging all meats? Into the draught - See on Matthew 15:17 (note).
Purging all meats? - For what is separated from the different aliments taken into the stomach, and thrown out of the body, is the innutritious parts of all the meats that are eaten; and thus they are purged, nothing being left behind but what is proper for the support of the body.