Abu Ayyub reported: The Messenger of Allah, peace and blessings be upon him, said, “It is not lawful for a Muslim to boycott his brother for more than three nights, such that they meet each other and turn away. The better of the two is the one who initiates the greeting of peace.”
Source: Ṣaḥīḥ al-Bukhārī 5727, Ṣaḥīḥ Muslim 2560
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
عَنْ أَبِي أَيُّوبَ الْأَنْصَارِيِّ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ لَا يَحِلُّ لِمُسْلِمٍ أَنْ يَهْجُرَ أَخَاهُ فَوْقَ ثَلَاثِ لَيَالٍ يَلْتَقِيَانِ فَيُعْرِضُ هَذَا وَيُعْرِضُ هَذَا وَخَيْرُهُمَا الَّذِي يَبْدَأُ بِالسَّلَامِ
5727 صحيح البخاري كتاب الأدب باب الهجرة
2560 صحيح مسلم كتاب البر والصلة والآداب باب تحريم الهجر فوق ثلاث بلا عذر شرعي