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السيوطي:٢٧٣٨٨a

"يَا فُلَانُ: أَلَا تَتَّقِى الله؟ أَلَا تَنْظُرُ كَيْفَ تُصَلِّى؟ إِنَّ أَحَدَكُمْ إِذَا قَامَ يُصَلِّى إِنَّمَا يَقُومُ يُنَاجِى رَبَّهُ، فَلْيَنْظُرْ كَيْفَ يُنَاجيهِ، إِنَّكُمْ تَروْنَ أَنِّى لَا أَرَاكُمْ، إِنِّى وَالله لأَرَى مَنْ خَلْفَ ظَهْرى، كَمَا أَرَى مَنْ بَيْنَ يَدَىَّ".  

[م] مسلم [ن] النسائي عن أبى هريرة

See similar narrations below:

Collected by Ḥākim
hakim:861ʿAlī b. Ḥamshādh al-ʿAdl > Hishām b. ʿAlī > ʿAyyāsh b. al-Walīd al-Raqqām > ʿAbd al-Aʿlá > Muḥammad b. Isḥāq > Saʿīd b. Abū Saʿīd from his father > Abū Hurayrah

[Machine] The Messenger of Allah ﷺ prayed the Dhuhr prayer with us, and when he finished, he called out to a man who was at the back of the rows and said, "O so-and-so, don't you fear Allah? Don't you pay attention to how you pray? Indeed, when any of you stands for prayer, he is conversing privately with his Lord, so let him pay attention to how he converses with Him. Surely, you all see me, but by Allah, I see what is behind my back just as I see what is in front of me."  

الحاكم:٨٦١حَدَّثَنَا عَلِيُّ بْنُ حَمْشَاذَ الْعَدْلُ ثنا هِشَامُ بْنُ عَلِيٍّ ثنا عَيَّاشُ بْنُ الْوَلِيدِ الرَّقَّامُ ثنا عَبْدُ الْأَعْلَى ثنا مُحَمَّدُ بْنُ إِسْحَاقَ أَخْبَرَنِي سَعِيدُ بْنُ أَبِي سَعِيدٍ عَنْ أَبِيهِ عَنْ أَبِي هُرَيْرَةَ قَالَ

صَلَّى بِنَا رَسُولُ اللَّهِ ﷺ الظُّهْرَ فَلَمَّا سَلَّمَ نَادَى رَجُلًا كَانَ فِي آخِرِ الصُّفُوفِ فَقَالَ «يَا فُلَانُ أَلَا تَتَّقِي اللَّهَ؟ أَلَا تَنْظُرُ كَيْفَ تُصَلِّي؟ إِنَّ أَحَدَكُمْ إِذَا قَامَ يُصَلِّي إِنَّمَا يَقُومُ يُنَاجِي رَبَّهُ فَلْيَنْظُرْ كَيْفَ يُنَاجِيهِ إِنَّكُمْ تَرَوْنَ أَنِّي لَا أَرَاكُمْ إِنِّي وَاللَّهِ لَأَرَى مِنْ خَلْفِ ظَهْرِي كَمَا أَرَى مِنْ بَيْنِ يَدَيَّ»  

«هَذَا حَدِيثٌ صَحِيحٌ عَلَى شَرْطِ مُسْلِمٍ وَلَمْ يُخَرِّجَاهُ عَلَى هَذِهِ السِّيَاقَةِ» على شرط مسلم