(9) باب تَحْرِيمِ الظَّنِّ وَالتَّجَسُّسِ وَالتَّنَافُسِ وَالتَّنَاجُشِ وَنَحْوِهَا
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
Don't have estranged relations (with the others) and don't nurse enmity and don't enter into a transaction when the other (has already entered) and be fellow-brothers and servants of Allah.
Reference: Sahih Muslim 2563 b
In-book reference: Book 45, Hadith 36
USC-MSA web (English) reference(deprecated numbering scheme): Book 32, Hadith 6215