[Machine] The Prophet ﷺ said, "The prayer of a man or anyone who does not straighten his back during bowing and prostration is not accepted."
عَنِ النَّبِيِّ ﷺ قَالَ لَا تُجْزِئُ صَلَاة الرجل أَوْ أَحَدٍ لَا يُقِيمُ ظَهْرَهُ فِي الرُّكُوعِ وَالسُّجُودِ