佛說目連問戒律中五百輕重事經 2.17

2.17

問：「比丘早起得用鉢食不？用有何咎耶？」答：「一切食皆應用鉢。若一日都不用鉢，犯墮。」

Question: "May a bhikṣu, rising early, use his pātra to eat? What fault is there in using it?"
Answer: "The pātra should be used for all meals. If throughout an entire day he does not use the pātra at all, he commits a pāyattika offense."