摩訶止觀 4.97

4.97

三、既不能絕穀餌果，又不能頭陀乞食，外護檀越送食供養，亦可得受。又僧中如法結淨食，亦可得受，下士也。

Third, being unable to abstain from grains and feed on fruits, and also unable to beg for food through dhūta, one may also receive food delivered as offerings by supporting dānapatis from outside. Moreover, one may also receive food prepared in accordance with the Vinaya within the Saṅgha through purity rituals; these are inferior persons.