Ya'la bin Uqbah narrated: I woke up in the morning (in Ramadan) in a state of major ritual impurity (janabah), so I came to Abu Hurayrah (may Allah be pleased with him) and asked him. He said to me: "Do not fast." I said: Shall I not fast (today) and make it up later? He said: "No, rather do not fast." So I came to Marwan bin al-Hakam and asked him, and told him what Abu Hurayrah (may Allah be pleased with him) had said. He sent Abd al-Rahman bin al-Harith bin Hisham to Sayyidah Aishah (may Allah be pleased with her) to ask her. Sayyidah Aishah (may Allah be pleased with her) said: "The Prophet (peace and blessings be upon him) would go out for the Fajr prayer while water (of the ritual bath after janabah) was dripping from his head, and then he would fast that day." So he went back to Marwan and told him this, and Marwan said: Go to Abu Hurayrah and tell him. So he told him, and Abu Hurayrah (may Allah be pleased with him) said: "I did not hear this myself from the Prophet (peace and blessings be upon him); rather, al-Fadl bin Abbas (may Allah be pleased with him) narrated this hadith to me from the Prophet (peace and blessings be upon him)."
Hadith Referenceالمعجم الكبير للطبراني / باب الفاء / 15838