四分律行事鈔資持記 3.774

3.774

八中，入他房者，謂入師房請問之法。外彈指者，警內令知也。正念住者，無餘想也。次問經者，即正問時法。下床問者，從座起故。不念外緣，須諦受故。設解作禮，謝開示故；反向出戶，不背師故。

In the eighth part, "entering another's room" refers to the protocol for entering a master's room to ask questions. "Snapping the fingers outside" is to alert those inside so they know. "Abiding in right mindfulness" means having no distracting thoughts. Next, "asking about the scriptures" refers to the protocol when actually asking questions. "Descending from the bed to ask" is because one rises from the seat. "Not thinking of external conditions" is because one must listen attentively and receive it. "Bow after having understood" is to thank him for the instruction; "facing backward when exiting the door" is so as not to turn one's back on the master.