大比丘三千威儀 1.88

1.88

復有五事：一者朝暮往問訊安否。二者往當著袈裟脫帽。三者往至戶前當三彈指，不得縱橫入。四者當頭面著地作禮，前長跪問消息。五者若師言：「賢者！某人來說卿所作不如法。汝自知犯過不？」設有，即當悔過言：「某實愚癡。」若無有，不得還語。師教去，即起作禮，還向出戶。

There are another five matters: first, go morning and evening to inquire after his wellbeing. Second, when going, wear the kāṣāya and take off the cap. Third, upon arriving before the door, snap the fingers three times, and do not barge in heedlessly. Fourth, place the head and face to the ground in veneration, kneel upright before him, and inquire after his health. Fifth, if the master says, "Virtuous one! So-and-so came and said that what you have done is not according to the Dharma. Do you know yourself whether you have committed an offense or not?" If one has, one should immediately repent, saying, "I was truly foolish." If one has not, one must not talk back. When the master instructs one to leave, immediately rise, pay obeisance, turn around, and exit through the door.