An Nur Ayah 27

يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُواْ لَا تَدْخُلُواْ بُيُوتًا غَيْرَ بُيُوتِكُمْ حَتَّىٰ تَسْتَأْنِسُواْ وَتُسَلِّمُواْ عَلَىٰٓ أَهْلِهَا‌ۚ ذَٲلِكُمْ خَيْرٌ لَّكُمْ لَعَلَّكُمْ تَذَكَّرُونَ ٢٧ O believers! Do not enter any house other than your own until you have asked for permission and greeted its occupants. This is best for you, so perhaps you will be mindful.