Musnad Ahmad 1156:152

'Abd al-Razzaq and Ibn Bakr narrated to us, they said: Ibn Jurayj informed us, he said: And Ibn Shihab narrated to me, from Abu Bakr ibn 'Abd al-Rahman, from his father 'Abd al-Rahman, from Umm Salamah and 'Aishah: "That the Prophet, peace and blessings of Allah be upon him, would be overtaken by dawn while he was in a state of janabah (major ritual impurity) from his wives, then he would perform ghusl (ritual bath) and fast." Ibn Bakr said: "The two wives of the Prophet, peace and blessings of Allah be upon him."