From:
Theravāda Vinaya Theravāda Collection on Monastic Law
Mahāvibhaṅga The Great Analysis
Sekhiyakaṇḍa The chapter on training
Sakkaccavagga The subchapter on respectfully
32. Pattasaññīsikkhāpada 32. The training rule on attention on the almsbowl
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 tahaṁ tahaṁ olokentā piṇḍapātaṁ bhuñjanti, ākirantepi atikkantepi na jānanti …pe…. At that time the monks from the group of six were eating almsfood while looking here and there, and they did not know whether people were still giving or whether they had received too much. …
“Pattasaññī piṇḍapātaṁ bhuñjissāmīti sikkhā karaṇīyā”ti. “‘I will eat almsfood with attention on the almsbowl,’ this is how you should train.”
Pattasaññinā piṇḍapāto bhuñjitabbo. Almsfood is to be eaten with attention on the bowl.
Yo anādariyaṁ paṭicca tahaṁ tahaṁ olokento piṇḍapātaṁ bhuñjati, āpatti dukkaṭassa. If a monk, out of disrespect, eats almsfood while looking here and there, he commits an offense of wrong conduct.
Anāpatti—There is no offense:
asañcicca …pe… if it is unintentional;
ādikammikassāti. if he is the first offender.
Dutiyasikkhāpadaṁ niṭṭhitaṁ. The second training rule is finished.