Abu Hurairah reported the Messenger of Allah (saws ) as saying:
Avoid (or be aware of ) suspicion for suspicion is the most lying form of talk. Do not be inquisitive ( or eavesdrop ) about one another, or spy on one another.
Sahih (Al-Albani)Sunan Abi Dawud 4917
In-book : Book 43, Hadith 145