大比丘三千威儀 2.26

2.26

復有五事：一者人來授物，手近當更澡手；二者不得持上著鉢中；三者若見不可意不應食，亦不得使左右人知；四者食中不得唾上座前；五者不應飯而飯之，墮罪。

There are further five matters: first, when someone comes to offer something and their hand gets near, one should wash hands again; second, one must not hold it high and drop it into the pātra; third, if one sees something displeasing, one should not eat it, nor should one let the persons to one's left and right know; fourth, during the meal, one must not spit in front of the sthavira; fifth, if one eats when one should not eat, one falls into an offense.