From Abu Hurairah (radiyallaahu 'anhu) who said that Allaah's Messenger said:
From the perfection of a person's Islaam is that he leaves alone that which does not concern him.
So he halts at his limits and does not exceed and pass beyond them. He knows that prying into that which does not concern him and asking about it is not fitting for him. Rather it is forbidden for him and something he has to avoid. So he complies with Allaah's orders and keeps away from what he has forbidden, since: