HOW THE PROPHET, praise and peace be upon him, OFFERED THE VOLUNTARY NIGHT PRAYER H 1192 "The Messenger of Allah, praise and peace be upon him, offered a succession of two units of prayer at night followed by one unit of prayer." R 1192 Bukhari and Muslim with a chain up to ibn Omar who related this.
1169- وعنه ، قَالَ : كَانَ النَّبيُّ صلى الله عليه وآله وسلم يُصَلِّي مِنَ اللَّيْلِ مَثْنَى مَثْنَى ، وَيُوتِرُ بِرَكْعَةٍ .متفقٌ عَلَيْهِ .