四分律刪繁補闕行事鈔 3.282

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《三千威儀》云：入他房：一於外彈指；二當脫帽；三作禮；四正念住，教坐乃坐；五不忘持經。入問經五事：一如法下床問；二不得共坐；三不解當直問；四不念外緣；五設解，頭面作禮，反向出戶。

The Three Thousand Deportments states: Entering another's room: first, snap the fingers from outside; second, remove one's hat; third, pay homage; fourth, abide with right mindfulness, sitting only when instructed to sit; fifth, do not forget to hold the sūtras. Five things for entering to inquire about sūtras: first, step down from the seat according to the Dharma to inquire; second, do not sit together; third, directly ask what is not understood; fourth, do not think of external conditions; fifth, having understood, pay homage with head to the ground and turn around to exit through the door.