大比丘三千威儀 1.53

1.53

不應作禮有五事：一者至舍後還，不得中道為人作禮，亦莫受人禮；二者上座臥不得為作禮，亦莫受人禮；三者上座澡嗽口不得為作禮，自嗽口亦莫受人禮；四者上座收槃未竟不得為作禮，自前槃未收亦莫受人禮；五者上座飯不得為作禮，自飯亦莫受人禮。

There are five matters where one should not pay homage: first, when returning from the privy, one must not pay homage to others on the way, nor should one receive homage from others; second, when a sthavira is lying down, one must not pay homage to him, nor should one receive homage from others; third, when a sthavira is washing or rinsing his mouth, one must not pay homage to him, nor when rinsing one's own mouth should one receive homage from others; fourth, when a sthavira has not finished clearing his tray, one must not pay homage to him, nor when the tray before oneself has not been cleared should one receive homage from others; fifth, when a sthavira is eating, one must not pay homage to him, nor while oneself is eating should one receive homage from others.