Abu Bakr bin Abd al-Rahman says: My father and I were with Marwan bin al-Hakam, who was the governor of Madinah, and it was mentioned to him that Sayyiduna Abu Hurayrah (may Allah be pleased with him) says: "Whoever wakes up in the morning in a state of janabah, let him break his fast that day." Marwan said: "O Abd al-Rahman, I adjure you to go to the Mother of the Believers Sayyidah Aishah (may Allah be pleased with her) and the Mother of the Believers Sayyidah Umm Salamah (may Allah be pleased with her) and ask them both about this." Abu Bakr says: So Abd al-Rahman went, and I was with him, until we came to Sayyidah Aishah (may Allah be pleased with her). Abd al-Rahman greeted her with salam and said: "O Mother of the Believers, we were with Marwan and the whole matter was mentioned, that Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: 'Whoever wakes up in the morning in a state of janabah, let him break his fast that day.'" Sayyidah Aishah (may Allah be pleased with her) said: "It is not as Sayyiduna Abu Hurayrah (may Allah be pleased with him) said. O Abd al-Rahman, do you turn away from what the Messenger of Allah (peace and blessings be upon him) used to do?" Abd al-Rahman said: "No, by Allah, that is not the case." Sayyidah Aishah (may Allah be pleased with her) said: "I bear witness that the Messenger of Allah (peace and blessings be upon him) would wake up in the morning in a state of janabah from intercourse, not from a wet dream, and then fast that day." Then we left and went to Sayyidah Umm Salamah (may Allah be pleased with her) and asked her, and she said the same as Sayyidah Aishah (may Allah be pleased with her) had said. Then we came to Marwan, and Abd al-Rahman told him what the two of them had said. Marwan said: "O Abu Muhammad, I adjure you to ride my mount that is at the door, go to Sayyiduna Abu Hurayrah (may Allah be pleased with him) and inform him of this." So Abd al-Rahman rode and I rode too, and we came to Sayyiduna Abu Hurayrah (may Allah be pleased with him). Abd al-Rahman talked with him for a while, then mentioned this matter to Sayyiduna Abu Hurayrah (may Allah be pleased with him), and Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: "I have no knowledge of this; an informant told me."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 7995