Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
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السيوطي:٢٣٤١٨a –

"مَنْ هَجَرَ أَخَاهُ فَوْقَ ثَلاثٍ فَهُوَ فِي النارِ، إِلَّا أَنْ يَتَدَارَكَهُ اللهُ بِكَرَامَتِهِ".  

[طب] الطبرانى في الكبير عن فضالة بن عبيد

See similar narrations below:

Collected by Ṭabarānī

عَامِرُ بْنُ يَحْيَى الْمَعَافِرِيُّ، عَنْ فَضَالَةَ

tabarani:15966 – Ibrāhīm b. Duḥaym al-Dimashqī from my father > ʿAbdullāh b. Yaḥyá al-Maʿāfirī > Saʿīd b. Abū Ayyūb > Khālid b. Yazīd > ʿĀmir b. Yaḥyá > Faḍālah b. ʿUbayd

[Machine] The Messenger of Allah ﷺ said, "Whoever abandons his brother for more than three days, then he is in the Fire, unless Allah grants him mercy."  

الطبراني:١٥٩٦٦ – حَدَّثَنَا إِبْرَاهِيمُ بْنُ دُحَيْمٍ الدِّمَشْقِيُّ ثنا أَبِي ثنا عَبْدُ اللهِ بْنُ يَحْيَى الْمَعَافِرِيُّ عَنْ سَعِيدِ بْنِ أَبِي أَيُّوبَ عَنْ خَالِدِ بْنِ يَزِيدَ عَنْ عَامِرِ بْنِ يَحْيَى عَنْ فَضَالَةَ بْنِ عُبَيْدٍ

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «مَنْ هَجَرَ أَخَاهُ فَوْقَ ثَلَاثٍ فَهُوَ فِي النَّارِ إِلَّا أَنْ يَتَدَارَكَهُ اللهُ بِكَرَمِهِ»