Messenger of Allah ﷺ said, "Do you consider or see that my face is towards the Qibla? By Allah, neither your submissiveness nor your bowing is hidden from me, surely I see you from my back." (Using translation from Bukhārī 418)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ هَلْ تَرَوْنَ قِبْلَتِي هَاهُنَا؟ فَوَاللهِ مَا يَخْفَى عَلَيَّ خُشُوعُكُمْ وَلَا رُكُوعُكُمْ إِنِّي لَأَرَاكُمْ مِنْ وَرَاءِ ظَهْرِي