Musnad Ahmad 789:10

Yunus narrated to us, Abu al-Ashhab narrated to us, from Ali ibn al-Hakam, from Abu Barzah al-Aslami—Abu al-Ashhab said: I do not know it except from the Prophet, may Allah bless him and grant him peace—he said: "Indeed, among what I fear for you are the desires of error in your bellies and your private parts, and the misleading trials."