15. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from al-Hassan ibn Ali ibn Yaqtin from his brother, Al- Husayn, from Ali ibn Yaqtin who has said the following: “I once asked abu al-Hassan عليه السلام, about a man who forgets to wash clean his urethra but he takes Wudu’ and performs Salah (prayer). He (the Imam) said, ’He must wash his urethra clean and perform his Salah (prayer) again, but he does not have to take Wudu’ again.’” H 3872, Ch. 12, h 16