Musnad Ahmad 32:1590

Mu'ammal narrated to us, Hammad narrated to us, Thabit narrated to us, from Anas, that a group of the companions of the Messenger of Allah (peace and blessings of Allah be upon him) said to one another: "I will not marry." Another said: "I will pray and not sleep." Another said: "I will fast and not break my fast." This reached the Prophet (peace and blessings of Allah be upon him), so he said: "What is the matter with people who said such and such? But I fast and I break my fast, I pray and I sleep, and I marry women. So whoever turns away from my Sunnah is not of me."