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
suyuti:4-2064b – al-Walīd
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السيوطي:٤-٢٠٦٤b –

"عن الْوَلِيدِ قال: صُمْنَا عَلَى عَهْدِ عَلِىٍّ ثَمَانيةً وعِشْرِينَ يَوْمًا فأَمَرَنَا بِقَضَاءِ يَوْمٍ".  

[خ] البخاري في تاريخه، [ق] البيهقى في السنن

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Collected by Bayhaqī
bayhaqi:8204 – Abū Bakr Muḥammad b. Ibrāhīm al-Fārisī > Ibrāhīm b. ʿAbdullāh al-Aṣbahānī > Muḥammad b. Sulaymān b. Fāris > Muḥammad b. Ismāʿīl al-Bukhārī > Abū Nuʿaym > Ḥumayd

[Machine] We fasted for twenty-eight days in adherence to the covenant of Ali, and then he commanded us to observe one day of fasting.  

البيهقي:٨٢٠٤ – وَأَخْبَرَنَا أَبُو بَكْرٍ مُحَمَّدُ بْنُ إِبْرَاهِيمَ الْفَارِسِيُّ أنبأ إِبْرَاهِيمُ بْنُ عَبْدِ اللهِ الْأَصْبَهَانِيُّ أنبأ مُحَمَّدُ بْنُ سُلَيْمَانَ بْنِ فَارِسٍ ثنا مُحَمَّدُ بْنُ إِسْمَاعِيلَ الْبُخَارِيُّ ثنا أَبُو نُعَيْمٍ ثنا حُمَيْدٌ يَعْنِي ابْنَ عَبْدِ اللهِ الْأَصَمَّ الْكُوفِيَّ سَمِعَ الْوَلِيدَ قَالَ

صُمْنَا عَلَى عَهْدِ عَلِيٍّ ؓ ثَمَانِيَةً وَعِشْرِينَ يَوْمًا فَأَمَرَنَا بِقَضَاءِ يَوْمٍ