四分律行事鈔資持記 2.1199

2.1199

不犯中四。第二律作為病人乞，得而食之；此開自食。自他交乞，乃是為他；律云：或己他為他，他為己是也。

Under non-offense, there are four. The second: the vinaya formulates begging for a sick person, and obtaining and eating it; this permits eating it oneself. Mutual begging between oneself and another is actually for another; the vinaya states: "either oneself and another act for another, or another acts for oneself," which is this.