(17) باب صَلاَةِ اللَّيْلِ وَعَدَدِ رَكَعَاتِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي اللَّيْلِ وَأَنَّ الْوِتْرَ رَكْعَةٌ وَأَنَّ الرَّكْعَةَ صَلاَةٌ صَحِيحَةٌ
'A'isha reported:
The Messenger of Allah (ﷺ) used to pray in the night and when he observed Witr, he said to me: O 'A'isha, get up and observe Witr. (IT)
Reference (IT): Sahih Muslim 744 a (IT)
In-book reference (IT): Book 6, Hadith 163 (IT)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1618 (IT)