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
muslim:1149b – Abū Bakr b. Abū Shaybah > ʿAbdullāh b. Numayr > ʿAbdullāh b. ʿAṭāʾ > ʿAbdullāh b. Buraydah from his father

I was sitting with the Messenger of Allah ﷺ ; the rest of the hadith is the same but with this variation that the (the narrator) said:" Fasts of two months."  

مسلم:١١٤٩b – وَحَدَّثَنَاهُ أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ نُمَيْرٍ عَنْ عَبْدِ اللَّهِ بْنِ عَطَاءٍ عَنْ عَبْدِ اللَّهِ بْنِ بُرَيْدَةَ عَنْ أَبِيهِ ؓ قَالَ

كُنْتُ جَالِسًا عِنْدَ النَّبِيِّ ﷺ بِمِثْلِ حَدِيثِ ابْنِ مُسْهِرٍ غَيْرَ أَنَّهُ قَالَ صَوْمُ شَهْرَيْنِ