Al-Ahzab 33:53 يا ايها الذين امنوا لا تدخلوا بيوت النبي الا ان يوذن لكم الى طعام غير ناظرين اناه ولاكن اذا دعيتم فادخلوا فاذا طعمتم فانتشروا ولا مستانسين لحديث ان ذالكم كان يوذي النبي فيستحيي منكم والله لا يستحيي من الحق واذا سالتموهن متاعا فاسالوهن من وراء حجاب ذالكم اطهر لقلوبكم وقلوبهن وما كان لكم ان توذوا رسول الله ولا ان تنكحوا ازواجه من بعده ابدا ان ذالكم كان عند الله عظيما ٥٣

Believers, do not enter the Prophet’s apartments for a meal unless you are given permission to do so; do not linger until [a meal] is ready. When you are invited, go in; then, when you have taken your meal, leave. Do not stay on and talk, for that would offend the Prophet, though he would shrink from asking you to leave. God does not shrink from the truth. When you ask his wives for something, do so from behind a screen: this is purer both for your hearts and for theirs. It is not right for you to offend God’s Messenger, just as you should never marry his wives after him: that would be grievous in God’s eyes.