大比丘三千威儀 1.77

1.77

有五事應相入室：一者問訊、二者病瘦往瞻視、三者問經、四者有所借、五者眾人使往呼。

There are five matters for which one should enter one another's rooms: first, to pay greetings; second, to go and tend to someone who is sick and emaciated; third, to ask about the sūtras; fourth, to borrow something; fifth, when dispatched by the community to go and call someone.