(40) باب عِظَةِ الإِمَامِ النَّاسَ فِي إِتْمَامِ الصَّلاَةِ، وَذِكْرِ الْقِبْلَةِ
Narrated Anas bin Malik:
The Prophet (ﷺ) led us in a prayer and then got up on the pulpit and said, "In your prayer and bowing, I certainly see you from my back as I see you (while looking at you.)"
Reference: Sahih al-Bukhari 419
In-book reference: Book 8, Hadith 69
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 8, Hadith 411