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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
bayhaqi:5475 – Abū ʿAbdullāh al-Ḥāfiẓ And ʾAbū ʿAbd al-Raḥman al-Sulamī Waʾabū Bakr b. al-Ḥasan al-Qāḍī Waʾabū Bakr Muḥammad b. Muḥammad b. Aḥmad b. Rajāʾ al-Adīb Waʾabū Naṣr Aḥmad b. ʿAlī al-Qāḍī Waʾabū Muḥammad b. Ḥāmid al-Muqriʾ Waʾabū Ṣādiq b. Abū al-Fawāris al-ʿAṭṭār > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Muḥammad b. Khālid b. Khulay > Aḥmad b. Khālid al-Wahbī > al-Ḥasan Wahū Ibn ʿUmārah al-Bajalī > al-Ḥakam > Mujāhid > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ stayed in Khaybar for forty days, praying two units of prayer alone. Al-Hasan bin Umara also performed this prayer, although he did not need to do so.  

البيهقي:٥٤٧٥ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو عَبْدِ الرَّحْمَنِ السُّلَمِيُّ وَأَبُو بَكْرِ بْنُ الْحَسَنِ الْقَاضِي وَأَبُو بَكْرٍ مُحَمَّدُ بْنُ مُحَمَّدِ بْنِ أَحْمَدَ بْنِ رَجَاءٍ الْأَدِيبُ وَأَبُو نَصْرٍ أَحْمَدُ بْنُ عَلِيٍّ الْقَاضِي وَأَبُو مُحَمَّدِ بْنُ حَامِدٍ الْمُقْرِئُ وَأَبُو صَادِقِ بْنُ أَبِي الْفَوَارِسِ الْعَطَّارُ قَالُوا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا مُحَمَّدُ بْنُ خَالِدِ بْنِ خُلَيٍّ ثنا أَحْمَدُ بْنُ خَالِدٍ الْوَهْبِيُّ ثنا الْحَسَنُ وَهُوَ ابْنُ عُمَارَةَ الْبَجَلِيُّ عَنِ الْحَكَمِ عَنْ مُجَاهِدٍ عَنِ ابْنِ عَبَّاسٍ قَالَ

أَقَامَ رَسُولُ اللهِ ﷺ بِخَيْبَرَ أَرْبَعِينَ يَوْمًا يُصَلِّي رَكْعَتَيْنِ رَكْعَتَيْنِ تَفَرَّدَ بِهِ الْحَسَنُ بْنُ عُمَارَةَ وَهُوَ غَيْرُ مُحْتَجٍّ بِهِ