45. The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship - كتاب البر والصلة والآداب
9) Chapter: The Prohibition Of Suspicion, Spying, Competition, Artificial Inflation Of Prices, And So On
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.
9) باب تَحْرِيمِ الظَّنِّ وَالتَّجَسُّسِ وَالتَّنَافُسِ وَالتَّنَاجُشِ وَنَحْوِهَا
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا عَبْدُ الْعَزِيزِ، - يَعْنِي ابْنَ مُحَمَّدٍ - عَنِ الْعَلاَءِ، عَنْ
أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ . " لاَ تَهَجَّرُوا وَلاَ تَدَابَرُوا
وَلاَ تَحَسَّسُوا وَلاَ يَبِعْ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ وَكُونُوا عِبَادَ اللَّهِ إِخْوَانًا "