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
bayhaqi:20008 – Abū ʿAbdullāh al-Ḥāfiẓ > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > al-ʿAbbās b. Muḥammad al-Dūrī > ʿUbaydullāh b. Mūsá > Abū Jaʿfar al-Rāzī > al-Rabīʿ > Abū al-ʿĀliyah > Ubī b. Kaʿb

[Machine] "He used to fast for three consecutive days."  

البيهقي:٢٠٠٠٨ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا الْعَبَّاسُ بْنُ مُحَمَّدٍ الدُّورِيُّ ثنا عُبَيْدُ اللهِ بْنُ مُوسَى ثنا أَبُو جَعْفَرٍ الرَّازِيُّ عَنِ الرَّبِيعِ عَنْ أَبِي الْعَالِيَةِ عَنْ أُبِيِّ بْنِ كَعْبٍ ؓ

أَنَّهُ كَانَ يَقْرَأُ فَصِيَامُ ثَلَاثَةِ أَيَّامٍ مُتَتَابِعَاتٍ  

See similar narrations below:

Collected by Ḥākim
hakim:3091 – Abū ʿAbdullāh Muḥammad b. Yaʿqūb al-Ḥāfiẓ > Muḥammad b. ʿAbd al-Wahhāb b. Ḥabīb al-ʿAbdī > Jaʿfar b. ʿAwn > Abū Jaʿfar al-Rāzī > al-Rabīʿ b. Anas > Abū al-ʿĀliyah > Ubay b. Kaʿb > Kān

[Machine] He used to recite it as "So whoever does not find [the means for] fasting, then the fasting of three consecutive days [is required]."  

الحاكم:٣٠٩١ – أَخْبَرَنَا أَبُو عَبْدِ اللَّهِ مُحَمَّدُ بْنُ يَعْقُوبَ الْحَافِظُ ثنا مُحَمَّدُ بْنُ عَبْدِ الْوَهَّابِ بْنِ حَبِيبٍ الْعَبْدِيُّ ثنا جَعْفَرُ بْنُ عَوْنٍ أَنْبَأَ أَبُو جَعْفَرٍ الرَّازِيُّ عَنِ الرَّبِيعِ بْنِ أَنَسٍ عَنْ أَبِي الْعَالِيَةِ عَنْ أُبَيِّ بْنِ كَعْبٍ

أَنَّهُ كَانَ يَقْرَؤُهَا «فَمَنْ لَمْ يَجِدْ فَصِيَامُ ثَلَاثَةِ أَيَّامٍ مُتَتَابِعَاتٍ»  

هَذَا حَدِيثٌ صَحِيحُ الْإِسْنَادِ وَلَمْ يُخَرِّجَاهُ صحيح