Sahih Muslim , Book 6, Hadith 137 (In-Book) ⓘ
Alqama b. Waqqas reported: I asked 'A'isha how the Messenger of Allah did in the two rak'ahs as he (observed them) sitting. She said: He would recite (the Qur'an) in them, and when he intended to bow, he would stand up and then bowed.
وَحَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ، حَدَّثَنَا مُحَمَّدُ بْنُ عَمْرٍو، حَدَّثَنِي مُحَمَّدُ بْنُ إِبْرَاهِيمَ، عَنْ عَلْقَمَةَ بْنِ وَقَّاصٍ، قَالَ قُلْتُ لِعَائِشَةَ كَيْفَ كَانَ يَصْنَعُ رَسُولُ اللَّهِ صلى الله عليه وسلم فِي الرَّكْعَتَيْنِ وَهُوَ جَالِسٌ قَالَتْ كَانَ يَقْرَأُ فِيهِمَا فَإِذَا أَرَادَ أَنْ يَرْكَعَ قَامَ فَرَكَعَ .
also referenced under: Hadith 731 (Reference) & Book 4, Hadith 1592 (USC-MSA)