四分律比丘含注戒本 3.47

3.47

尼吉羅。不犯者，若來受教勅聽法，自食令授也。

For a bhikṣuṇī, it is a duṣkṛta. As for non-offense: if they come to receive instructions and hear the Dharma, and he tells them to serve the food that he himself eats.