佛說目連問戒律中五百輕重事經 1.162

1.162

問：「比丘共盤，食他分，犯何事？」答：「若問聽，無罪。不聽，取食犯墮。若不問亦犯墮。所以不犯者，以共仰手故受。」

Question: "If a bhikṣu shares a platter and eats another's portion, what offense does he commit?"
Answer: "If he asks and is permitted, there is no offense. If not permitted, taking and eating it incurs a pāyattika. If he does not ask, it also incurs a pāyattika. The reason it is not an offense [if permitted] is that they jointly hold up their hands to receive it."