It is narrated from the Mother of the Believers, Sayyidah Umm Salamah (may Allah be pleased with her), that the Messenger of Allah (peace and blessings be upon him) would reach the morning in a state of major ritual impurity (janabah) due to intercourse, not due to a wet dream, and then he would fast (in that state).
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ubaydullah bin Umar except Adi bin al-Fadl; Ismah bin al-Mutawakkil is alone in narrating it."