O you who believe! Enter not the dwellings of the Prophet for a meal without waiting for the proper time, unless permission is given to you. But if you are invited, enter, and when the meal is ended, then disperse. Linger not for vain conversation; surely this gives the Prophet trouble, but he forbears from you, and Allah does not forbear from the truth. And when you ask of them (the wives) anything, ask of them from behind a curtain; this is purer for your heart and for their heart; and it does not behove you that you should cause annoyance to the Messenger of Allah, nor that you should ever marry his wives after him. Verily, this is grievous in the sight of Allah.