Hadith 1281

‘Ali said that God’s Messenger used to pray three rak'as when observing the witr, reciting nine suras from al-Mufassal in the course of them, three in each rak'a, the last of them being “Say, He is God, One” (Al-Qur’an; 112). Tirmidhi transmitted it.

وَعَنْ عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُوتِرُ بِثَلَاثٍ يَقْرَأُ فِيهِنَّ بِتِسْعِ سُوَرٍ مِنَ الْمُفَصَّلِ يَقْرَأُ فِي كُلِّ رَكْعَةٍ بِثَلَاثِ سُوَرٍ آخِرُهُنَّ: (قل هوا لله أحد) رَوَاهُ التِّرْمِذِيّ

Reference: 5612810
In-book reference: Book 4, Hadith 1281