Chapter on the Prayer Times (Mawaqit)
Tahdhīb al-Aḥkām|Volume 2|Book 1|Chapter 13
اَلْحَسَنُ بْنُ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ زِيَادٍ عَنْ خَلِيلٍ اَلْعَبْدِيِّ عَنْ زِيَادِ بْنِ عِيسَى عَنْ عَلِيِّ بْنِ حَنْظَلَةَ قَالَ قَالَ أَبُو عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ:« فِي كِتَابِ عَلِيٍّ عَلَيْهِ اَلسَّلاَمُ« اَلْقَامَةُ ذِرَاعٌ وَ اَلْقَامَتَانِ ذِرَاعَانِ»»
Al-Hasan ibn Muhammad from Muhammad ibn Ziyad from Khalil al-Abdi from Ziyad ibn Isa from Ali ibn Hanzalah, who said:
Abu Abdillah عليه السلام said: "In the Book of (Imam) Ali عليه السلام, peace be upon him, it is stated: 'One qamah is one arm’s span (dhira‘), and two qamahs are two arm’s spans (dhira‘ayn).'"
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 268
- Ṣaḥīḥ al-Tahdhīb