(17) باب صَلاَةِ اللَّيْلِ وَعَدَدِ رَكَعَاتِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي اللَّيْلِ وَأَنَّ الْوِتْرَ رَكْعَةٌ وَأَنَّ الرَّكْعَةَ صَلاَةٌ صَحِيحَةٌ
This hadith has been narrated by Hisham with the same chain of transmitters.
Reference: Sahih Muslim 737 b
In-book reference: Book 6, Hadith 150
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1605