四分律行事鈔資持記 2.1452

2.1452

等食戒。（居士下飯已，入內取羹還，食飯已盡，與彼羹已，復還取飯，還食羹盡，譏云似餓人。）正須者，謂隨食盡已，更須受益，非貪速故。

The precept on eating proportionately. (When a householder had served the rice and went inside to fetch the soup, the monk had already finished eating the rice; having given him the soup, the householder returned to fetch more rice, whereupon the monk had already finished the soup; the censure said, 'Like a starving person.') 'Genuine need' means that as each portion of food is finished, one needs more served, not out of a greedy rush.