(192) بَابُ الشَّحْنَاءِ
Abu Hurayra reported that the Messenger of Allah, may Allah blesshim and grant him peace, said, "Beware of opinion. Opinion is the mostlying form of speech. Do not try to ensnare one another (in sales) norenvy one another nor hate one another nor shun one another. Rather be theslaves of Allah and brothers."
Reference: Al-Adab Al-Mufrad 410
In-book reference: Book 22, Hadith 14
English translation: Book 22, Hadith 410