It is narrated from Sayyiduna Uqbah bin Amir and Sayyiduna Fadalah bin Ubayd (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) would reach the morning in a state of major ritual impurity (janabah), then he would take a ritual bath (ghusl) and fast.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14972