Sahih al-Bukhari

Sahih al-Bukhari 1138

How was the Salat of the Prophet (pbuh) and how many Rak'a he used to offer at night?
Arabic hadith text
حَدَّثَنَا مُسَدَّدٌ، قَالَ حَدَّثَنَا يَحْيَى، عَنْ شُعْبَةَ، قَالَ حَدَّثَنِي أَبُو جَمْرَةَ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَكَانَ صَلاَةُ النَّبِيِّ صلى الله عليه وسلم ثَلاَثَ عَشْرَةَ رَكْعَةً‏.‏ يَعْنِي بِاللَّيْلِ‏.‏
Translation
Narrated Ibn `Abbas

The prayer of the Prophet (ﷺ) used to be of thirteen rak`at, i.e. of the night prayer.