大比丘三千威儀 1.76

1.76

There are further five matters: first, one must not wear it to enter the room of the three masters; second, one must not hold it when asking about the sūtras; third, one must not wear or hold it to pay homage to an upādhyāya or ācārya; fourth, one must not wear it to pay homage to the saṅgha; fifth, at dusk one must not use it to wash.