(127) باب الاِطْمَأْنِينَةِ حِينَ يَرْفَعُ رَأْسَهُ مِنَ الرُّكُوعِ
Narrated Thabit:
Anas used to demonstrate to us the prayer of the Prophet (ﷺ) and while demonstrating, he used to raise his head from bowing and stand so long that we would say that he had forgotten (the prostration).
Reference: Sahih al-Bukhari 800
In-book reference: Book 10, Hadith 195
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 12, Hadith 765