(56) باب فِي الظَّنِّ
Abu Hurairah reported the Messenger of Allah (May peace be upon him) as saying:
Avoid suspicion for suspicion is the most lying form of talk. Do not be inquisitive about one another, or spy on one another.
Reference: Sunan Abi Dawud 4917
In-book reference: Book 43, Hadith 145
English translation: Book 42, Hadith 4899