Sunan Ibn Majah, Book 5, Hadith 1233 (In-Book) ⓘ
It was narrated that ‘Aishah said: “The Messenger of Allah used to say Taslim after every two Rak’ah, and he would perform Witr with one Rak’ah.”
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا شَبَابَةُ، عَنِ ابْنِ أَبِي ذِئْبٍ، عَنِ الزُّهْرِيِّ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، قَالَتْ كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ يُسَلِّمُ فِي كُلِّ ثِنْتَيْنِ وَيُوتِرُ بِوَاحِدَةٍ .
also referenced under: Hadith 1177 (Reference) & Volume 2, Book 5, Hadith 1177 (DarusSalam)