1 – Muhammad b. Ya`qub from Muhammad b. Yahya from al-`Amraki from `Ali b. Ja`far from his brother Musa b. Ja`far عليه السلام.
He said: I asked him about a man who has a nosebleed. So he blows his nose and some of that becomes blood, a small section, and it hits his vessel, is it appropriate for him to do wudu from it? So he said: If it is not something that is clearly seen in the water, then there is no harm, and if it is something that is clear, then do not do wudu from it.
He said: And I asked him about a man who has a nosebleed, while he is doing wudu, so a drop (of blood) drops in his vessel, is wudu appropriate from it? He said: No.
And `Ali b. Ja`far narrated it in his book.

I say: That which is understood from the first hadith is the contacting of the blood to the vessel, and doubt regarding the contacting of the water, as is apparent from the question and the answer, so there is no ambiguity in it.

[375] 1 ـ محمّد بن يعقوب، عن محمد بن يحيى، عن العمركي، عن علي بن جعفر، عن أخيه موسى بن جعفر ( عليه السلام ) قال: سألته عن رجل رعف فامتخط، فصار بعض ذلك الدم قطعاً صغاراً، فاصاب إناءه، هل يصلح له الوضوء منه؟ فقال: إن لم يكن شيئاً يستبين في الماء فلا باس، وإن كان شيئا بينا فلا تتوضا منه.
قال: وسألته عن رجل رعف وهو يتوضا، فتقطر قطرة في إنائه، هل يصلح الوضوء منه؟ قال: لا.
ورواه علي بن جعفر في كتابه.

أقول: الذي يفهم من أول الحديث إصابة الدم الإناء، والشك في إصابة الماء، كما يظهر من السؤال والجواب، فلا إشكال فيه.