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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
hakim:4417 – Aḥmad b. Yaʿqūb al-Thaqafī al-Maʿmarī > Jaʿfar b. Musāfir > ʿAbdullāh b. Nāfiʿ > Nāfiʿ b. Abū Nuʿaym > Nāfiʿ > Ibn ʿUmar

[Machine] "And Abu Bakr's caliphate lasted for two years and seven months." Al-Dhahabi did not mention it in the summary.  

الحاكم:٤٤١٧ – أَخْبَرَنِي أَحْمَدُ بْنُ يَعْقُوبَ الثَّقَفِيُّ الْمَعْمَرِيُّ ثنا جَعْفَرُ بْنُ مُسَافِرٍ ثنا عَبْدُ اللَّهِ بْنُ نَافِعٍ عَنْ نَافِعِ بْنِ أَبِي نُعَيْمٍ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ

«وَلِيَ أَبُو بَكْرٍ فِي خِلَافَتِهِ سَنَتَيْنِ وَسَبْعَةَ أَشْهُرٍ» سكت عنه الذهبي في التلخيص