From:
Theravāda Vinaya Theravāda Collection on Monastic Law
Mahāvibhaṅga The Great Analysis
Sekhiyakaṇḍa The chapter on training
Kabaḷavagga The subchapter on mouthfuls
46. Avagaṇḍakārakasikkhāpada 46. The training rule on stuffing the cheeks
Tena samayena buddho bhagavā sāvatthiyaṁ viharati jetavane anāthapiṇḍikassa ārāme. At one time the Buddha was staying at Sāvatthī in the Jeta Grove, Anāthapiṇḍika’s Monastery.
Tena kho pana samayena chabbaggiyā bhikkhū avagaṇḍakārakaṁ bhuñjanti …pe… At that time the monks from the group of six ate stuffing their cheeks. …
“Na avagaṇḍakārakaṁ bhuñjissāmīti sikkhā karaṇīyā”ti. “‘I will not eat stuffing my cheeks,’ this is how you should train.”
Na avagaṇḍakārakaṁ bhuñjitabbaṁ. One should not eat stuffing one’s cheeks.
Yo anādariyaṁ paṭicca ekato vā ubhato vā gaṇḍaṁ katvā bhuñjati, āpatti dukkaṭassa. If a monk, out of disrespect, eats stuffing one or both cheeks, he commits an offense of wrong conduct.
Anāpatti—There is no offense:
asañcicca, if it is unintentional;
assatiyā, if he is not mindful;
ajānantassa, if he does not know;
gilānassa, if he is sick;
phalāphale, if it is any kind of fruit;
āpadāsu, if there is an emergency;
ummattakassa, if he is insane;
ādikammikassāti. if he is the first offender.
Chaṭṭhasikkhāpadaṁ niṭṭhitaṁ. The sixth training rule is finished.