(a) Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "When the water reaches forty large jars, it does not carry filth."
(b) Jabir (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him) that: "When the water reaches forty large jars." But this narration is not correct. Imam al-Daraqutni (may Allah have mercy on him) says that al-Qasim erred in this narration; he is a severely weak narrator who made many mistakes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1248