The Chapter on Obligatory Prayers
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 30
في أيامه صلى الله عليه وآله: فَرُوِيَ عَنْ أَسْمَاءَ بِنْتِ عُمَيْسٍ أَنَّهَا قَالَتْ: بَيْنَمَا رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ نَائِمٌ ذَاتَ يَوْمٍ وَ رَأْسُهُ فِي حَجْرِ عَلِيٍّ عَلَيْهِ اَلسَّلاَمُ فَفَاتَتْهُ اَلْعَصْرُ حَتَّى غَابَتِ اَلشَّمْسُ فَقَالَ « اَللَّهُمَّ إِنَّ عَلِيّاً كَانَ فِي طَاعَتِكَ وَ طَاعَةِ رَسُولِكَ فَارْدُدْ عَلَيْهِ اَلشَّمْسَ » قَالَتْ أَسْمَاءُ فَرَأَيْتُهَا وَ اَللَّهِ غَرَبَتْ ثُمَّ طَلَعَتْ بَعْدَ مَا غَرَبَتْ وَ لَمْ يَبْقَ جَبَلٌ وَ لاَ أَرْضٌ إِلاَّ طَلَعَتْ عَلَيْهِ حَتَّى قَامَ عَلِيٌّ عَلَيْهِ اَلسَّلاَمُ فَتَوَضَّأَ وَ صَلَّى ثُمَّ غَرَبَتْ.
As for during his lifetime: It is narrated from Asma bint Umais that She said: "One day, while the Messenger of Allah صلى الله عليه وعلى آله وسلم was resting with his head in the lap of Ali عليه السلام, the Asr prayer passed, and the sun had set. The Prophet صلى الله عليه وعلى آله وسلم said: 'O’ Allah سبحانه وتعالى, Ali was engaged in obedience to You and Your Messenger, so return the sun for him.' Asma said: 'By Allah سبحانه وتعالى, I saw the sun set, then it rose again after it had set, and no mountain or land remained except that it was illuminated by its light until Ali عليه السلام stood, performed ablution, and prayed. Then the sun set again.'".
- Ṣaḥīḥ al-Faqīh