(181) باب فِي صَلاَةِ الْقَاعِدِ
'A'ishah said:
The Messenger of Allah (ﷺ) used to pray standing at night for a long time, and used to pray sitting at night for a long time. When he prayed standing, he bowed standing, and when he prayed sitting, he bowed sitting.
Reference: Sunan Abi Dawud 955
In-book reference: Book 2, Hadith 566
English translation: Book 2, Hadith 955