佛說目連問戒律中五百輕重事 1.139

1.139

問：「已受四事長請，小小緣事出行，得食外食、服外藥不？」答：「施主聽，得。」

Question: "Having already accepted a standing invitation for the four requisites, if one travels out for some minor matter, may one eat outside food or take outside medicine?" Answer: "If the donor permits it, one may."