四分律行事鈔資持記 2.1161

2.1161

三十九。（佛在舍衛，人為父母等，於四衢道乃至廟中祭祀供養；糞掃衣乞食比丘自取食之，俗譏因制。）名中。比丘凡食，必從人受；故違此教，名不受食。然受兼手口，食通四藥，如後具明。

[Precept] thirty-nine. (The Buddha was in Śrāvastī. People made sacrificial offerings at crossroads and even in shrines for their parents and others; rag-robe-wearing, begging bhikṣus took and ate it themselves, and because of worldly criticism the prohibition was instituted.) Regarding the name: whenever a bhikṣu eats, he must receive it from another person; deliberately violating this instruction is called "eating unreceived [food]". However, reception includes both hand and mouth, and food applies to all four medicines, as fully explained below.