Fa il lam tajidoo feehaaa ahadan falaa tadkhuloohaa hattaa yu'zana lakum wa in qeela lakumurji'oo farji'oo huwa azkaa lakum; wallaahu bimaa ta'maloona 'Aleem
Then, if you do not find anyone therein, do not enter until you have been given permission, and if you are told to go back, you should go back. This is a purer way for you; and Allah has full knowledge of what you do.