8. Prayer (Kitab Al-Salat) Detailed Injunctions about Witr - كتاب الوتر
10) Chapter: The Qunut In The (Other) Prayers
Narrated Someone who prayed with the Prophet:
Muhammad ibn Sirin said: Someone who prayed the morning prayer along with the Prophet (ﷺ) narrated to me: When he raised his head after the second rak'ah, he remained standing for a short while.