The Benefits of Israu Miraju

There are other theological benefits as well believe it or not there even some fiqh benefits of Israu Miraju. Of the legal rulings we learn is that we need to ask permission before entering doors where do we get this from? Jibril knocking and asking permission and we learn as well that when somebody says who is there we respond with our names because Jibril said this is Jibril and not it's me so he mentions himself by name of them. The one who is walking should start the salam with the one who is sitting and standing even if he is more noble than him. It is completely permissible to sit with your back facing the kibilah