وَحَدَّثَنِي عَنْ 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 يُهَاجِرَ أَخَاهُ فَوْقَ ثَلاَثِ لَيَالٍ ‏"‏ ‏.‏

Yahya related to me from Malik from Ibn Shihab from Anas ibnMalik that the Messenger of Allah, may Allah bless him and grant himpeace, said, "Do not be angry with each other and do not envy eachother and do not turn away from each other, and be slaves of Allah,brothers. It is not halal for a muslim to shun his brother for morethan three nights." Translation Not Available

Book Ref: Muwatta Imam Malik Book 47 Hadith 1649
Web Ref:  Muwatta Imam Malik Book 47 Hadith 14