كتاب البر والصلة والآداب
45  
The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship
(7)
Chapter: The Prohibition Of Mutual Jealousy And Hatred, And Turning Away From One Another
(7)
باب النَّهْىِ عَنِ التَّحَاسُدِ، وَالتَّبَاغُضِ، وَالتَّدَابُرِ، ‏‏
Sahih Muslim 2558 b

Anas b. Malik reported Allah's Messenger (ﷺ) as saying:

Neither nurse mutual hatred, nor jealousy, nor enmity, and become as fellow brothers and servants of Allah. It is not lawful for a Muslim that he should keep his relations estranged with his brother beyond three days.
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنِ ابْنِ شِهَابٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ لاَ تَبَاغَضُوا وَلاَ تَحَاسَدُوا وَلاَ تَدَابَرُوا وَكُونُوا عِبَادَ اللَّهِ إِخْوَانًا وَلاَ يَحِلُّ لِمُسْلِمٍ أَنْ يَهْجُرَ أَخَاهُ فَوْقَ ثَلاَثٍ ‏"‏ ‏.‏
Reference : Sahih Muslim 2558b
In-book reference : Book 45, Hadith 26
USC-MSA web (English) reference : Book 32, Hadith 6205
  (deprecated numbering scheme)