33:53
O you who believe! (Do) not enter (the) houses (of) the Prophet except when permission is given to you for a meal, without awaiting its preparation. But when you are invited, then enter; and when you have eaten, then disperse and not seeking to remain for a conversation. Indeed, that was troubling the Prophet, and he is shy of (dismissing) you. But Allah not is shy of the truth. And when you ask them (for) anything then ask them from behind a screen. That (is) purer for your hearts and their hearts. And not is for you that you trouble (the) Messenger (of) Allah and not that you should marry his wives from after him, ever. Indeed, that is near Allah an enormity.
42:51
And not is for any human that should speak to him Allah except (by) revelation or from behind a veil or (by) sending a messenger then he reveals by His permission what He wills. Indeed, He (is) Most High, Most Wise.
49:4
Indeed, those who call you from behind the private chambers, most of them (do) not understand.
59:14
Not they will fight you all except in towns fortified or from behind walls. Their violence among themselves (is) severe. You think they (are) united, but their hearts (are) divided. That (is) because they (are) a people, not they reason.