Taking Shower or Bath

19. Muhammad ibn Yahya has narrated from Ali ibn al-Hassan al-Taymiy from Muhammad ibn abu Hamzah from ‘Umar ibn Yazid who has said the following: “Abu ‘Abd Allah عليه السلام, has said that ’Amir al-Mu’minin has said, ‘You must not lie down on your back in the bathhouse; it melts the fat of kidneys and must not rub your feet with pottery because it may cause leprosy.”’