[Machine] The Messenger of Allah ﷺ said, "The prayer of someone is not valid or it was said, 'The person does not properly straighten their back during the bowing and prostration.'"
قَالَ رَسُولُ اللهِ ﷺ لَا تُجْزِئُ صَلَاةُ أَحَدٍ أَوْ قَالَ الرَّجُلِ لَا يُقِيمُ ظَهْرَهُ فِي الرُّكُوعِ وَالسُّجُودِ