Muwatta Malik, Book 47, Hadith 15 (USC-MSA)

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."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ إِيَّاكُمْ وَالظَّنَّ فَإِنَّ الظَّنَّ أَكْذَبُ الْحَدِيثِ وَلاَ تَجَسَّسُوا وَلاَ تَحَسَّسُوا وَلاَ تَنَافَسُوا وَلاَ تَحَاسَدُوا وَلاَ تَبَاغَضُوا وَلاَ تَدَابَرُوا وَكُونُوا عِبَادَ اللَّهِ إِخْوَانًا ‏" ‏ ‏.‏

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also referenced under: Book 47, Hadith 1650 (In-Book)