Chapter on Sunnahs of Fasting
Tahdhīb al-Aḥkām|Volume 4|Book 2|Chapter 9
وَ عَنْهُ عَنِ اَلْحَسَنِ بْنِ مَحْبُوبٍ عَنْ أَبِي أَيُّوبَ عَنِ اَلْفُضَيْلِ بْنِ يَسَارٍ قَالَ قَالَ أَبُو عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ:» إِذَا صَامَ أَحَدُكُمُ اَلثَّلاَثَةَ اَلْأَيَّامِ فِي اَلشَّهْرِ فَلاَ يُجَادِلَنَّ أَحَداً وَ لاَ يَجْهَلْ وَ لاَ يُسْرِعْ إِلَى اَلْأَيْمَانِ وَاَلْحَلْفِ بِاللَّهِ وَ إِنْ جَهِلَ عَلَيْهِ أَحَدٌ فَلْيَتَحَمَّلْ«.
And from him, from al-Hasan ibn Mahbub, from Abu Ayyub, from al-Fudayl ibn Yasar, who said:
Abu Abdillah عليه السلام, peace be upon him, said: “When one of you fasts the three days in the month, then he must not dispute with anyone, nor act ignorantly, nor hasten to oaths and swearing by Allah سبحانه وتعالى. And if anyone acts ignorantly toward him, then let him bear it patiently.”
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 259
- Ṣaḥīḥ al-Tahdhīb, p. 358