Narrated by Ali ibn Ibrahim, from his father, from Ibn Abi Umayr, from Hammad, from al-Halabi: Abu Abdullah عليه السلام was asked about a man who performs ghusl and then finds wetness, having urinated before performing ghusl. Imam عليه السلام said: "If he had urinated before the ghusl, he does not need to repeat the ghusl."