四分律比丘含注戒本 3.19

3.19

若不訶而食，咽咽犯。尼吉羅。不犯者：若語言「大姊且止，須諸比丘食竟」；若尼自為檀越；若檀越設食，令尼處分。若不故作偏為彼此者，不犯。

(If one eats without rebuking her, an offense is committed mouthful by mouthful. For a bhikṣuṇī, a duṣkṛta. There is no offense if one says: "Elder sister, wait a moment; wait until all the bhikṣus have finished eating"; if the bhikṣuṇī is herself the donor; if the donor prepares the meal and orders the bhikṣuṇī to arrange it; or if she does not intentionally show bias toward one or the other, there is no offense.)