Chapter on Recommended (Nafl) Prayers During Travel
Tahdhīb al-Aḥkām|Volume 2|Book 1|Chapter 3
وَ عَنْهُ عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ صَفْوَانَ اَلْجَمَّالِ قَالَ: كَانَ أَبُو عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ يُصَلِّي صَلاَةَ اَللَّيْلِ بِالنَّهَارِ عَلَى رَاحِلَتِهِ أَيْنَمَا تَوَجَّهَتْ بِهِ
And from him, from Ahmad ibn Muhammad from Safwan the camel driver. He said:
Abu Abdillah عليه السلام used to pray the night prayer during the day on his mount, in whatever direction it faced.
- Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 2, p. 16
- Ṣaḥīḥ al-Tahdhīb, p. 139