رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 1169
The Book of Virtues
Excellence of Standing in Prayer at Night
وَعَنْهُ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، يُصَلِّي مِنَ اللَّيْلِ مَثْنَى مَثْنَى، وَيُوتِرُ بِرَكْعَةٍ. ((مُتَّفَقٌ عَلَيْهِ)) .
Ibn 'Umar (May Allah be pleased with them) reported: The Prophet (ﷺ) performed the night prayer in pairs (i.e., Rak'ah) and made it odd number by observing one Rak'ah (as Witr). [Al-Bukhari and Muslim].
Riyad as-Salihin, 1169