Tahdhīb al-Aḥkām 2, narration 8

Translation

Al-Husayn ibn Sa‘id narrated from Uthman ibn Isa from Ibn Maskan from Sulayman ibn Khalid from Abu Abdillah (a.s). Imam (a.s) said: “The prayer of the nafilah (supererogatory prayer) is eight rak‘ahs when the sun passes the meridian (before Dhuhr), and six rak‘ahs after Dhuhr, and two rak‘ahs before ‘Asr, and four rak‘ahs after Maghrib, and two rak‘ahs after the final Isha prayer, you recite in them one hundred verses, whether standing or sitting, and standing is better, but do not count them among the fifty (rak‘ahs). And eight rak‘ahs at the end of the night, in the night prayer (salat al-layl), you recite ‘Qul huwa Allahu ahad’ (Surah Ikhlas) and ‘Qul ya ayyuha al-kafirun’ (Surah Al Kafirun) in the first two rak‘ahs, and in the rest you may recite whatever you wish from the Qur’an. Then comes the witr prayer, three rak‘ahs, in which you recite ‘Qul huwa Allahu ahad’ (Surah Ikhlas) in all of them, and you separate between them with a taslim. Then the two rak‘ahs before the dawn prayer, in the first of them you recite ‘Qul ya ayyuha al-kafirun’ (Surah Al Kafirun), and in the second (unit) ‘Qul huwa Allahu ahad’ (Surah Ikhlas).”

Translation: Haydar Ali Shaykh ibn Muhammad — published with the edition, reproduced verbatim.