[Machine] Because the Messenger of Allah ﷺ circled around the Kaaba from behind, Allah the Almighty said: "And let them circle around the ancient House." [Al-Hajj 29]
لِأَنَّ رَسُولَ اللهِ ﷺ طَافَ بِالْبَيْتِ مِنْ وَرَائِهِ قَالَ اللهُ تَعَالَى {وَلْيَطَّوَّفُوا بِالْبَيْتِ الْعَتِيقِ} [الحج 29]