question #2 Sahih Muslim 731c, Book 6, Hadith 136 : How does the Prophet’s practice of standing up to recite additional verses before bowing influence the understanding of prayer?

The Messenger of Allah (ﷺ) used to recite in sitting position (while observing the Tahajjud prayer) and when he intended to bow, he would stand up and recite (for the duration in which) a man (ordinarily) recites forty verses.