[830] Origin at Sāvatthī (Sāvatthīnidānaṃ). Now at that time the group-of-six bhikkhus (chabbaggiyā bhikkhū) ate almsfood (piṇḍapāta) without care, as though not wishing to eat. …
The training should be undertaken thus: "I will eat almsfood attentively (sakkaccaṃ)."
Almsfood should be eaten attentively. Whoever, out of disrespect, eats almsfood inattentively, as though not wishing to eat, incurs an offense of wrong-doing (dukkaṭa).
There is no offense: if it is unintentional; if he is unmindful; if he does not know; if he is ill; in emergencies; if he is insane; if he is the first offender (ādikammika).
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.