O you who believe, do not enter the houses of the Prophet, unless you are permitted for a meal, not (so early as) to wait for its preparation. But when you are invited, go inside. Then, once you have had the meal, just disperse, and (do) not (sit for long) being keen for a chat. This (conduct of yours) hurts the Prophet, but he feels shy of (telling) you (about it), but Allah is not shy of the truth. And when you ask any thing from them (the blessed wives of the Prophet), ask them from behind a curtain. That is better for the purity of your hearts and their hearts. It is not allowed for you that you hurt Allah’s Messenger, nor that you ever marry his wives after him. Indeed, it would be an enormity in the sight of Allah.
There is no sin for them (the wives of the Prophet) in (appearing without Hijāb before) their fathers, or their brothers, or the sons of their brothers, or the sons of their sisters, or their own (Muslim) women, or their slave-girls. And (O wives of the Prophet,) fear Allah. Surely, Allah is witness to every thing.