﴿ فَإِن لَّمْ تَجِدُوا۟ فِيهَآ أَحَدًۭا فَلَا تَدْخُلُوهَا حَتَّىٰ يُؤْذَنَ لَكُمْ ۖ وَإِن قِيلَ لَكُمُ ٱرْجِعُوا۟ فَٱرْجِعُوا۟ ۖ هُوَ أَزْكَىٰ لَكُمْ ۚ وَٱللَّهُ بِمَا تَعْمَلُونَ عَلِيمٌۭ ﴾

“Hence, [even] if you find no one within [the house], do not enter it until you are given leave; and if you are told, “Turn back,” then turn back. This will be most conducive to your purity; and God has full knowledge of all that you do.”

And if you do not find anyone in them to give you permission still do not enter them until permission has been given to you. And if it is said to you when you are seeking permission ‘Go away’ then go away for this going away is purer that is better for you than sitting and waiting at the doorstep. And God knows what you do whether you enter with permission or without it and He will requite you for it.