Surah Al-Ahzab, verse 53

يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ لَا تَدْخُلُوا۟ بُيُوتَ ٱلنَّبِىِّ إِلَّآ أَن يُؤْذَنَ لَكُمْ إِلَىٰ طَعَامٍ غَيْرَ نَـٰظِرِينَ إِنَىٰهُ وَلَـٰكِنْ إِذَا دُعِيتُمْ فَٱدْخُلُوا۟ فَإِذَا طَعِمْتُمْ فَٱنتَشِرُوا۟ وَلَا مُسْتَـْٔنِسِينَ لِحَدِيثٍ ۚ إِنَّ ذَٰلِكُمْ كَانَ يُؤْذِى ٱلنَّبِىَّ فَيَسْتَحْىِۦ مِنكُمْ ۖ وَٱللَّهُ لَا يَسْتَحْىِۦ مِنَ ٱلْحَقِّ ۚ وَإِذَا سَأَلْتُمُوهُنَّ مَتَـٰعًا فَسْـَٔلُوهُنَّ مِن وَرَآءِ حِجَابٍ ۚ ذَٰلِكُمْ أَطْهَرُ لِقُلُوبِكُمْ وَقُلُوبِهِنَّ ۚ وَمَا كَانَ لَكُمْ أَن تُؤْذُوا۟ رَسُولَ ٱللَّهِ وَلَآ أَن تَنكِحُوٓا۟ أَزْوَٰجَهُۥ مِنۢ بَعْدِهِۦٓ أَبَدًا ۚ إِنَّ ذَٰلِكُمْ كَانَ عِندَ ٱللَّهِ عَظِيمًا ﴿٥٣﴾

33:53 O you who believe, do not enter the houses of the Prophet, unless you are given permission for a meal; not so early as to wait for the meal to be prepared. But if you are invited, then enter, and when you have eaten, then disperse, without lingering for conversation. Such [behavior] causes annoyance to the Prophet; he is too shy to express it to you, but Allah is not shy of [telling] the truth. And if you ask his wives for something, ask them from behind a screen; that is purer for your hearts and their hearts. It is not lawful for you to cause annoyance to Allah’s Messenger, or to ever marry his wives after him, for that is indeed an enormous sin before Allah