五分比丘尼戒本 1.92

1.92

「若比丘尼，受別請眾食，除因緣，波逸提。因緣者，病時、施衣時、作衣時、行路時、船上行、時大會時，是名因緣。

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.