(22) باب أَفْضَلُ الصَّلاَةِ طُولُ الْقُنُوتِ
Jabir reported Allah's Messenger (ﷺ) as saying:
The most excellent prayer is that in which the duration of standing is longer.
Reference: Sahih Muslim 756 a
In-book reference: Book 6, Hadith 197
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1652