The Supplication of Qunoot in Witr Prayer
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 72
وَ كَانَ عَلِيُّ بْنُ اَلْحُسَيْنِ عَلَيْهِمَا اَلسَّلاَمُ سَيِّدُ اَلْعَابِدِينَ يَقُولُ: «اَلْعَفْوَ اَلْعَفْوَ» ثَلاَثَمِائَةِ مَرَّةٍ فِي اَلْوَتْرِ فِي اَلسَّحَرِ.
It is narrated that Imam Ali ibn al-Hussain عليه السلام, the Master of Worshippers (Zain al-Abidin), used to say, "Al-‘Afw, Al-‘Afw (Pardon, Pardon)" three hundred times during the Witr prayer at the time of Suhoor (the pre-dawn hours).
- Ṣaḥīḥ al-Faqīh