Sahih al-Bukhari 741

Arabic

حَدَّثَنَا إِسْمَاعِيلُ، قَالَ حَدَّثَنِي مَالِكٌ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ هَلْ تَرَوْنَ قِبْلَتِي هَا هُنَا وَاللَّهِ مَا يَخْفَى عَلَىَّ رُكُوعُكُمْ وَلاَ خُشُوعُكُمْ، وَإِنِّي لأَرَاكُمْ وَرَاءَ ظَهْرِي ‏"‏‏.‏

English translation

Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "You see me facing the Qibla; but, by Allah, nothing is hidden from me regarding your bowing and submissiveness and I see you from behind my back

Reference: Sahih al-Bukhari 741, Book of Call to Prayers (Adhaan). English translation by Dr. Muhammad Muhsin Khan.