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.
ahmad:17513Muḥammad b. Jaʿfar > Shuʿbah > Anas b. Sīrīn > ʿAbd al-Malik b. al-Minhāl from his father

[Machine] The Messenger of Allah ﷺ commanded us to fast on the days of the white (i.e., full moon). This is the fasting of the month.  

أحمد:١٧٥١٣حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ عَنْ أَنَسِ بْنِ سِيرِينَ عَنْ عَبْدِ الْمَلِكِ بْنِ الْمِنْهَالِ عَنْ أَبِيهِ قَالَ

أَمَرَنَا رَسُولُ اللهِ ﷺ بِأَيَّامِ الْبِيضِ فَهُوَ صَوْمُ الشَّهْرِ