四分律比丘含注戒本 1.446

1.446

彼執事人若在家、在市、作處，到彼前默然立。執事人問：「何緣此立？」比丘報言：「汝自知之。」若彼人言：「今我不知。」餘人知者，比丘當語：「彼人知之。」是默然相也。

If that attendant is at home, in the market, or at a workplace, [the bhikṣu] goes before him and stands silently. If the attendant asks, 'For what reason do you stand here?', the bhikṣu answers, 'You know for yourself.' If that person says, 'I do not know now,' but another person knows, the bhikṣu should say, 'That person knows.' This is the characteristic of being silent.