Chapter on Prayer in the Month of Ramadan
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 2|Chapter 24
وَرَوَى عَبْدُ اللَّهِ بْنُ الْمُغِيرَةِ، عَنْ عَبْدِ اللَّهِ بْنِ سِنَانٍ، عَنْ أَبِي عَبْدِ اللَّهِ عَلَيْهِ السَّلَامُ قَالَ: "سَأَلْتُهُ عَنِ الصَّلَاةِ فِي شَهْرِ رَمَضَانَ، فَقَالَ: ثَلَاثَ عَشْرَةَ رَكْعَةً، مِنْهَا الْوِتْرُ وَرَكْعَتَانِ قَبْلَ صَلَاةِ الْفَجْرِ، وَلَوْ كَانَ فَضْلًا كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ أَعْمَلَ بِهِ وَأَحَقَّ".
Abdullah ibn al-Mughira narrated from Abdullah ibn Sinan, who said: "I asked Abu Abdullah عليه السلام about the prayer during the Month of Ramadan. Imam عليه السلام said: 'Thirteen rak'ahs, including the witr prayer and two rak'ahs before the Fajr prayer. If there were any additional merit, the Messenger of Allah سبحانه وتعالى (peace be upon him and his family) would have been more diligent in performing it and more deserving of doing so.'"
- Ṣaḥīḥ al-Faqīh, p. 100