2 – And by his isnad from `Ali b. Ja`far from his brother Musa عليه السلام.
He said: I asked him about the house whose surface is urinated upon and one washes from janaba, then the rain comes in contact with it. Does one take from its water and do wudu with it for salat? So he said: If it flowed, then there is no harm with it.
He said: And I asked him about the man who passes in rain-water, in which wine had been poured, so it contacts his garment. Does he pray in it prior to washing it? So he said: He does not wash his garment or his leg, and he prays in it and there is no harm with it.
And the Shaykh also narrated it by his isnad from `Ali b. Ja`far.
 2 ـ وبإسناده، عن علي بن جعفر، عن أخيه موسى ( عليه السلام ) قال: سألته عن البيت يبال على ظهره، ويغتسل من الجنابة، ثم يصيبه المطر، أيؤخذ من مائه فيتوضأ به للصلاة؟ فقال: إذا جرى فلا بأس به.
قال: وسألته عن الرجل يمر في ماء المطر وقد صب فيه خمر، فأصاب ثوبه، هل يصلي فيه قبل أن يغسله؟ فقال: لا يغسل ثوبه ولا رجله، ويصلي فيه ولا بأس به
ورواه الشيخ أيضا بإسناده عن علي بن جعفر.