Chapter on Itikaf and What Fasting Is Obligatory in It
Tahdhīb al-Aḥkām|Volume 4|Book 2|Chapter 27
وَ رَوَى عَلِيُّ بْنُ اَلْحَسَنِ عَنْ عَلِيِّ بْنِ أَسْبَاطٍ عَنْ عَلاَءِ بْنِ رَزِينٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ قَالَ قَالَ أَبُو عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ:» لاَ يَكُونُ اَلاِعْتِكَافُ إِلاَّ بِصِيَامٍ«.
And Ali ibn al-Hasan narrated from Ali ibn Asbat, from Ala ibn Razin, from Muhammad ibn Muslim, who said:
Abu Abdillah عليه السلام, peace be upon him, said: “There is no seclusion (itikaf) except with fasting.”
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 361
- Ṣaḥīḥ al-Tahdhīb, p. 377