Matthew 15:17

ἀφεδρῶνα : here only, probably a Macedonian word = privy; a vulgar word and a vulgar subject which Jesus would gladly have avoided, but He forces Himself to speak of it for the sake of His disciples. The idea is: from food no moral defilement comes to the soul; such defilement as there is, purely physical, passing through the bowels into the place of discharge. Doubtless Jesus said this, otherwise no one would have put it into His mouth. Were the Twelve any the wiser? Probably the very rudeness of the speech led them to think.