四分律比丘含注戒本 3.18

3.18

and there is a bhikṣuṇī giving directions: "Give soup to so-and-so, give rice to so-and-so," that bhikṣu ought to speak to that bhikṣuṇī, saying: "Elder sister, wait a moment; wait until all the bhikṣus have finished eating." If not a single bhikṣu says to that bhikṣuṇī: "Elder sister, wait a moment; wait until all the bhikṣus have finished eating," that bhikṣu ought to confess to the other bhikṣus, saying: "Venerable sir! I have committed a blameworthy dharma, which ought not to be done. I now confess to the venerable sir!" This is called a confessable dharma.