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
hakim:3679 – Abū Zakariyyā al-ʿAnbarī > Muḥammad b. ʿAbd al-Salām > Isḥāq > Jarīr > ʿAṭāʾ b. al-Sāʾib > Saʿīd b. Jubayr

[Machine] "The loss of a believer is mourned for forty mornings" - Authentic chain of narration and it has not been excluded from the authentic collection.  

الحاكم:٣٦٧٩ – أَخْبَرَنَا أَبُو زَكَرِيَّا الْعَنْبَرِيُّ ثنا مُحَمَّدُ بْنُ عَبْدِ السَّلَامِ ثنا إِسْحَاقُ أَنْبَأَ جَرِيرٌ عَنْ عَطَاءِ بْنِ السَّائِبِ عَنْ سَعِيدِ بْنِ جُبَيْرٍ عَنِ ابْنِ عَبَّاسٍ

فِي قَوْلِهِ ﷻ {فَمَا بَكَتْ عَلَيْهِمُ السَّمَاءُ وَالْأَرْضُ} [الدخان 29] قَالَ «بِفَقْدَ الْمُؤْمِنِ أَرْبَعِينَ صَبَاحًا» صَحِيحُ الْإِسْنَادِ وَلَمْ يُخَرِّجَاهُ صحيح  

See similar narrations below:

Collected by Ḥākim
hakim:3768 – Abū ʿAbdullāh Muḥammad b. ʿAbdullāh b. Dīnār al-ʿAdl > al-Ḥusayn b. al-Faḍl > Abū Nuʿaym And ʾAbū Ghassān > Isrāʾīl > Simāk b. Ḥarb > ʿIkrimah > Ibn ʿAbbās al-Shams Wa-al-Qamar Biḥusbān al-Rḥmn 5

[Machine] "Through a chain of correct narrations, and they didn't exclude it, correct."  

الحاكم:٣٧٦٨ – حَدَّثَنَا أَبُو عَبْدِ اللَّهِ مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ دِينَارٍ الْعَدْلُ ثنا الْحُسَيْنُ بْنُ الْفَضْلِ ثنا أَبُو نُعَيْمٍ وَأَبُو غَسَّانَ قَالَا ثنا إِسْرَائِيلُ عَنْ سِمَاكِ بْنِ حَرْبٍ عَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ {الشَّمْسُ وَالْقَمَرُ بِحُسْبَانٍ} [الرحمن 5] قَالَ

«بِحِسَابٍ وَمَنَازِلَ» صَحِيحُ الْإِسْنَادِ وَلَمْ يُخَرِّجَاهُ صحيح