金剛般若經疏 1.23

1.23

經。飯食訖　演曰。第四事終。本行乞食為生福田。今若不食施福未滿故須飯食。寶雲經說。隨所乞得分為四分。一分擬與同梵行者。一分擬施貧下乞人。一分以施水陸眾生。一分自食。然以食供養諸佛及眾賢聖。然後自食當壞食。總如食曠野子肉等願得法身離諸過失。念報施主恩。如是總食。食者如來畢竟不食常有□□□□□形相伐佛受食。將詣餘方如香積飯施作佛事。

Sūtra: Having finished his meal,
Commentary: The fourth is the conclusion of the event. Originally going to beg for food was to generate a field of merit; now, if he did not eat, the merit of giving would not be complete; hence he must eat the food. The Ratnamegha Sūtra states: whatever is obtained from begging is divided into four portions: one portion is intended for fellow practitioners of pure conduct; one portion is intended for poor and lowly beggars; one portion is to be given to beings of water and land; one portion is for oneself to eat. Furthermore, one offers food to the Buddhas and the assembly of worthy and noble ones, and only afterward eats oneself. When destroying [and consuming] the food, one should regard it generally as eating the flesh of one's child in the wilderness, wishing to attain the Dharma-body and depart from all faults, mindfulness of repaying the benefactor's kindness. Eating in this general manner, the Tathāgata ultimately does not eat, constantly having […] appearances; the Buddha accepts food, taking it to other regions like the food of Gandhahastin to perform Buddha-work through giving.