金剛經纂要刊定記 3.27

3.27

寶雲下。顯齋儀也。此四事中，前二云擬、後二不云者，以梵行貧病來則與之，不來自食，後二不然，故不云耳。《十二頭陀經》除梵行者，以自乞故，故不分之。

The passage beginning "Baoyun..." clarifies the decorum of the meal. Among these four portions, the first two say "designated for," while the latter two do not say so, because if those living pure lives, the poor, or the sick come, one gives it to them, and if they do not come, one eats it oneself; the latter two are not like this, hence it is not said. The Twelve Dhūtas Sūtra excludes those living pure lives, because since they beg for themselves, one does not divide it with them.