@ A.N.... If everybody starts entering the mosque wearing shoes, we would need dozens of workers to clean the mosque after every prayer, not just every day. We do not think that anyone who accepts this would like to pray on a carpet that is full of dust and dirt, let alone other unclean and impure substances. Further more the Prophet (peace and blessings of Allah be upon him) took off his shoes whilst praying on one occasion because Jibreel told him that there was some dirt on them. D.W., Online response