Chapter on the Prayer Times (Mawaqit)
Tahdhīb al-Aḥkām|Volume 2|Book 1|Chapter 13
اَلْحَسَنُ بْنُ مُحَمَّدِ بْنِ سَمَاعَةَ عَنِ اِبْنِ فَضَّالٍ عَنِ اَلْقَاسِمِ بْنِ عُرْوَةَ عَنْ بُرَيْدٍ عَنْ أَحَدِهِمَا عَلَيْهِمَا اَلسَّلاَمُ قَالَ:« إِذَا غَابَتِ اَلْحُمْرَةُ مِنَ اَلْمَشْرِقِ فَقَدْ غَابَتِ اَلشَّمْسُ مِنْ شَرْقِ اَلْأَرْضِ وَ غَرْبِهَا»
Al-Hasan ibn Muhammad ibn Sama'ah narrated from Ibn Faddal from Al-Qasim ibn Urwah from Burayd from one of the two (Imams عليه السلام), peace be upon them:
Imam عليه السلام said: "When the redness disappears from the east, then the sun has set from the east of the earth and its west."
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 275
- Ṣaḥīḥ al-Tahdhīb, p. 161