Musnad Ahmad 32:1783

Aswad ibn Amir narrated to us, Hammad narrated to us, from Thabit, from Anas, that some people asked the wives of the Prophet, peace and blessings of Allah be upon him, about his worship in private. He said: So he praised Allah and extolled Him, then said: "What is the matter with people who ask about what I do? As for me, I pray and I sleep, I fast and I break my fast, and I marry women. So whoever turns away from my Sunnah, then he is not of me."