大比丘三千威儀 2.24

2.24

復有五事：一者已受莫離；二者不得狂左右顧視；三者已離當從上座受；四者設人不應不得食；五者若人宿與不相便，可當自作方便、若自呼人。

There are further five matters: first, having received it, do not move away; second, one must not frantically look left and right; third, having moved away, one should receive it following the sthavira; fourth, if the person [serving] does not respond, one must not eat; fifth, if one has an old conflict with that person that causes difficulty, one may make suitable arrangements oneself or call someone oneself.