The seventh condition: The place where a person places his forehead while in Sajdah, should not be higher or lower than a span of four fingers, when compared to
the place of thighs or toes of his feet. The details of this rule will be given in the rules relating to Sajdah.
898. For a Na-Mahram man and woman to be at a place, where there is a possibility of falling into sin is Haraam. As a recommended precaution, one must avoid praying at such places.
899. Prayers at a place where musical instrument etc. is being played, is not void, but hearing or performing it is a sin.
900. The obligatory precaution is that in normal situation, obligatory prayers should not be offered in the Ka’bah, and on the roof of the Holy Ka’bah, but there will be no harm if one is forced to do so.
901. There is no harm in offering Mustahab prayers in the Holy Ka’bah, or on its roof. In fact, it is Mustahab to offer two Rak’ats before every pillar within the Holy House.