Sahih Muslim, Hadith 2699
"O you who have believed, avoid much [negative] assumption. Indeed, some assumption is sin. And do not spy or backbite each other. Would one of you like to eat the flesh of his brother when dead? You would detest it. And fear Allah; indeed, Allah is Accepting of repentance and Merciful."
— Al Quran 49:12
— Al Quran 15:2
— Al Quran 3:160
— Al Quran 49:13
— Al Quran 23:118
— Al Quran 34:39
— Al Quran 82:6