佛說目連問戒律中五百輕重事經 1.139

1.139

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

Question: "Having accepted an invitation for long-term provision of the four requisites, if he goes out on minor matters, may he eat outside food and take outside medicines?"
Answer: "If the donor allows it, he may."