(18) باب كَيْفَ يَفْعَلُ إِذَا افْتَتَحَ الصَّلاَةَ قَائِمًا وَذِكْرِ اخْتِلاَفِ النَّاقِلِينَ عَنْ عَائِشَةَ فِي ذَلِكَ
It was narrated that 'Aishah said:
"The Messenger of Allah (ﷺ) used to pray for a long time at night. If he started to pray standing, he would bow standing and if he started to pray sitting, he would bow sitting."
Reference: Sunan an-Nasa'i 1646
In-book reference: Book 20, Hadith 49
English translation: Vol. 2, Book 20, Hadith 1647