五分比丘尼戒本 1.92

1.92

If a bhikṣuṇī accepts a group meal upon special invitation, except on proper occasions: it is a pāyattika. The proper occasions are: a time of illness, a time of robe-giving, a time of making robes, a time of traveling on foot, a time of traveling on a boat, or a time of a great assembly—these are called the proper occasions.