رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 1134
The Book of Virtues
Witr Prayer, its Time and Ruling
وَعَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا، عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: اِجْعَلُوا آخِرَ صَلَاتِكُمْ بِاللَّيْلِ وِتْرًا . ((مُتَّفَقٌ عَلَيْهِ))
Ibn 'Umar (May Allah be pleased with them) reported: The Prophet (ﷺ) said, "Make Witr prayer the last of your Salat at night." [Al-Bukhari and Muslim].
Riyad as-Salihin, 1134