كتاب البر والصلة والآداب
45  
The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship
(9)
Chapter: The Prohibition Of Suspicion, Spying, Competition, Artificial Inflation Of Prices, And So On
(9)
باب تَحْرِيمِ الظَّنِّ وَالتَّجَسُّسِ وَالتَّنَافُسِ وَالتَّنَاجُشِ وَنَحْوِهَا ‏‏
Sahih Muslim 2563 c

Abu Huraira reported Allah's Messenger (ﷺ) as saying. Don't nurse malice against one another, don't nurse aversion against one another and don't be inquisitive about one another and don't outbid one another (with a view to raising the price) and be fellow-brothers and servants of Allah.

حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا جَرِيرٌ، عَنِ الأَعْمَشِ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي، هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ لاَ تَحَاسَدُوا وَلاَ تَبَاغَضُوا وَلاَ تَجَسَّسُوا وَلاَ تَحَسَّسُوا وَلاَ تَنَاجَشُوا وَكُونُوا عِبَادَ اللَّهِ إِخْوَانًا ‏"‏ ‏.‏
Reference : Sahih Muslim 2563c
In-book reference : Book 45, Hadith 37
USC-MSA web (English) reference : Book 32, Hadith 6216
  (deprecated numbering scheme)