四分律行事鈔資持記 2.1115

2.1115

初緣，可足，即是正食。第四或病或作餘食法，則無犯故。

Thirty-five. (When the Buddha was in Śrāvastī, he taught the practice of eating a single meal, up to the bhikṣus becoming emaciated; the Buddha permitted eating to satiety, and furthermore, on account of caring for sick people, allowed the practice of leftover food; later, there were bhikṣus who greedily ate without knowing moderation, eating it whenever they got it, on which account he instituted [the prohibition].)