Muhammad bin Ali bin Mahbub narrated from Al-Haytham bin Abi Masruq Al-Nahdi, from Al-Hakam bin Miskin, from Sama‘ah, who said: I said to Abu Al-Hasan Musa عليه السلام: 'I urinate, then I wipe with stones. Afterward, some wetness appears from me following my act of istibra' (ensuring the bladder is emptied), which soils my garment. What should I do?' Imam عليه السلام said: 'There is no harm in it.'"