Chapter on Miscellaneous Topics
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 2|Chapter 36
وَ رُوِيَ عَنْ مُعَاوِيَةَ بْنِ عَمَّارٍ قَالَ: سَأَلْتُ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ عَنْ صِيَامِ أَيَّامِ اَلتَّشْرِيقِ قَالَ «إِنَّمَا نَهَى رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ عَنْ صِيَامِهَا بِمِنًى فَأَمَّا بِغَيْرِهَا فَلاَ بَأْسَ ».
It is narrated from Mu'awiyah ibn Ammar, who said: "I asked Abu Abdullah عليه السلام about fasting during the Days of Tashreeq. Imam عليه السلام replied: 'The Messenger of Allah سبحانه وتعالى (peace and blessings be upon him and his family) only prohibited fasting on those days in Mina. However, outside of Mina, there is no issue with fasting them.'"
- Ṣaḥīḥ al-Faqīh, p. 108