Mixing of Rain Water with Urine, with Water Used for Taking Ghusl (bath) Because of Carnal Relations, Touching of One’s Cloth with Water Used for Washing Because of Urine

4. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn ’Isma‘il from certain persons of our people who have said the following: “I once asked abu al-Hassan عليه السلام, about soil which is found with rain water. He (the Imam) said, ‘It is not harmful up to three days unless it is found out to have become Najis (unclean) by something after rainfall. If such drops sprinkle after three days, then you must wash, but if the road is clean, then you do not need to wash.’”