Dharmaguptaka-vinaya 15.21

15.21

不犯者，病人自乞、為病人乞，乞得而食；或己為彼、彼為己；若不乞而得，無犯。

There is no offence if a sick person solicits for himself, or one solicits for a sick person, and he eats after soliciting and receiving it; or if oneself does so for another, or another does so for oneself; or if one obtains it without soliciting: there is no offence.