Maliks Muwatta Book 47, Hadith Number 15.
Section : Shunning People.
Yahya related to me from Malik from Abu’z-Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, “Beware of suspicion. Suspicion is the most untrue speech. Do not spy and do not eavesdrop. Do not compete with each other and do not envy each other and do not hate each other and do not shun each other. Be slaves of Allah, brothers.”