四分律刪繁補闕行事鈔 3.264

3.264

二往訃法。《四分》云：若欲受請，應往眾僧常小食大食處住。若檀越白時到者，上座應在前，如雁行而去；諸比丘應偏袒右肩在後行。若有佛法僧、病比丘事者，當白上座，在前去。必於中有命梵難者，若問不問，聽去。若上座在道行大小便處，應待來，然後如前去。

Second, the procedure for proceeding to respond to an invitation. The Dharmaguptaka Vinaya states: If one wishes to receive an invitation, one should go and stay where the saṃgha usually takes their minor or major meals. If the dānapati announces that the time has arrived, the senior monk should be in front, proceeding in single file like flying geese; the other bhikṣus should bare their right shoulders and walk behind. If there are matters concerning the Buddha, Dharma, or Saṃgha, or a sick bhikṣu, one should inform the senior monk and go ahead. If among them there is danger to life or chastity, whether having asked or not, they are permitted to go. If the senior monk is relieving himself on the road, one should wait for him to return, and then proceed as before.