An-Nur 24:28

Fa-in lam tajidoo feeha ahadanfala tadkhulooha hatta yu/thanalakum wa-in qeela lakumu irjiAAoo farjiAAoo huwa azkalakum wallahu bima taAAmaloona AAaleem

And if you do not find anyone therein, do not enter them until permission has been given you. And if it is said to you, "Go back," then go back; it is purer for you. And Allāh is Knowing of what you do.

Even if you do not find anyone in them, do not enter therein until permission is given to you. And if it is said to you, ‘Go back’, just go back; it is more decent for you. Allah is All-Aware of what you do.