大比丘三千威儀 2.37

2.37

When wearing the saṃghāṭī, carrying the hand-cloth has five matters: first, one must not let the ends of the cloth hang down and be visible; second, one must not carry a white cloth; third, one should ruin its color to make it dark; fourth, one must not wipe the face; fifth, when dining, one should use it to cover the knees, and when dining is finished, remove it. If it is not removed, whenever someone comes to pay respects or when one stands up to leave, first take and fold it away.