It is not lawful to desert your brother for more than three nights
Sahih al-Bukhari 6076
Full Hadith
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 ”.
Narrated Anas bin Malik:
Allah’s Messenger (ﷺ) 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.“
Lesson
This Hadith explains the importance of forgiving and forgetting. If one’s brother/sister does something rude, one should not abandon them for longer than three nights; instead, he/she should forgive them, forget the deed, and continue life with them.