Sahih al-Bukhari, Hadith 6076 ⓘ
Narrated Anas bin Malik: Allah's Messenger said, "Do not hate one another, nor be jealous of one another; and do not desert one another, but O Allah's worshipers! Be Brothers! And it is unlawful for a Muslim to desert his brother Muslim (and not to talk to him) for more than three nights."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، 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 ثَلاَثِ لَيَالٍ " .
also referenced under: Book 78, Hadith 104 (In-Book) & Volume 8, Book 73, Hadith 99 (USC-MSA)