“Then Jesus said.
‘Are you also still
Without understanding?
Do you not see
That whatever goes
Into the mouth
Enters the stomach?
Then it goes out
Into the sewer.’”
ὁ δὲ εἶπεν Ἀκμὴν καὶ ὑμεῖς ἀσύνετοί ἐστε;
ὐ νοεῖτε ὅτι πᾶν τὸ εἰσπορευόμενον εἰς τὸ στόμα εἰς τὴν κοιλίαν χωρεῖ καὶ εἰς ἀφεδρῶνα ἐκβάλλεται;
There is something similar to this in Mark, chapter 7:18-19. Jesus seemed a little upset that they still did not understand what he was telling them about defilement (ὁ δὲ εἶπεν Ἀκμὴν καὶ ὑμεῖς ἀσύνετοί ἐστε). He pointed out that they had to understand (ὐ νοεῖτε) that everything entering into the mouth (ὅτι πᾶν τὸ εἰσπορευόμενον εἰς τὸ στόμα) went into the stomach (εἰς τὴν κοιλίαν χωρεῖ). From the stomach, it came out in a bowel movement that ended up in a sewer, latrine, or dung heap (καὶ εἰς ἀφεδρῶνα ἐκβάλλεται). There was a famous saying that it is harder to sell corn after it has been eaten by a pig than before it was eaten. Whatever went into your mouth would end up as defecation.