Musnad Ahmad 32:1061

Bahz and Hasan ibn Musa narrated to us, they said: Hammad narrated to us, Qatadah narrated to us, from Anas, who said: The Messenger of Allah, peace and blessings of Allah be upon him, used to say: "O Allah, I seek refuge in You from vitiligo, insanity, leprosy, and from the evil diseases."