I of all the people know best this verse of Al-Hijab. When Messenger of Allah ﷺ married Zainab bint Jahsh she was with him in the house and he prepared a meal and invited the people (to it). They sat down (after finishing their meal) and started chatting. So the Prophet ﷺ went out and then returned several times while they were still sitting and talking. So Allah revealed the Verse: 'O you who believe! Enter not the Prophet's houses until leave is given to you for a meal, (and then) not (so early as) to wait for its preparation .....ask them from behind a screen.' (33.53) So the screen was set up and the people went away.
أَنَسُ بْنُ مَالِكٍ أَنَا أَعْلَمُ النَّاسِ بِهَذِهِ الآيَةِ آيَةِ الْحِجَابِ لَمَّا أُهْدِيَتْ زَيْنَبُ إِلَى رَسُولِ اللَّهِ ﷺ كَانَتْ مَعَهُ فِي الْبَيْتِ صَنَعَ طَعَامًا وَدَعَا الْقَوْمَ فَقَعَدُوا يَتَحَدَّثُونَ فَجَعَلَ النَّبِيُّ ﷺ يَخْرُجُ ثُمَّ يَرْجِعُ وَهُمْ قُعُودٌ يَتَحَدَّثُونَ فَأَنْزَلَ اللَّهُ تَعَالَى {يَا أَيُّهَا الَّذِينَ آمَنُوا لاَ تَدْخُلُوا بُيُوتَ النَّبِيِّ إِلاَّ أَنْ يُؤْذَنَ لَكُمْ إِلَى طَعَامٍ غَيْرَ نَاظِرِينَ إِنَاهُ} إِلَى قَوْلِهِ {مِنْ وَرَاءِ حِجَابٍ} فَضُرِبَ الْحِجَابُ وَقَامَ الْقَوْمُ