“When the Messenger of Allah ﷺ bowed, he neither raised his head nor lowered it, rather (he did something) between that.”  

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا رَكَعَ لَمْ يَشْخَصْ رَأْسَهُ وَلَمْ يُصَوِّبْهُ وَلَكِنْ بَيْنَ ذَلِكَ  

“The Messenger of Allah ﷺ said: ‘No prayer is acceptable in which a man does not settle his spine when bowing and when prostrating.’”  

قَالَ رَسُولُ اللَّهِ ﷺ لاَ تُجْزِئُ صَلاَةٌ لاَ يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ  

“We set out until we came to the Messenger of Allah ﷺ, and we gave him our oath of allegiance and performed prayer behind him. He glanced out of the corner of his eye at a man who was not settling his spine when he bowed and prostrated. When the Prophet ﷺ finished the prayer, he said: ‘O Muslims, there is no prayer for the one who does not settle his spine when bowing and prostrating.’”  

خَرَجْنَا حَتَّى قَدِمْنَا عَلَى رَسُولِ اللَّهِ ﷺ فَبَايَعْنَاهُ وَصَلَّيْنَا خَلْفَهُ فَلَمَحَ بِمُؤْخِرِ عَيْنِهِ رَجُلاً لاَ يُقِيمُ صَلاَتَهُ يَعْنِي صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ فَلَمَّا قَضَى النَّبِيُّ ﷺ الصَّلاَةَ قَالَ يَا مَعْشَرَ الْمُسْلِمِينَ لاَ صَلاَةَ لِمَنْ لاَ يُقِيمُ صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ  

“I heard Wabisah bin Ma’bad saying: ‘I saw the Messenger of Allah ﷺ performing prayer, and when he bowed he made his back so straight that if water were poured on it, it would have stayed there.’”  

سَمِعْتُ وَابِصَةَ بْنَ مَعْبَدٍ يَقُولُ رَأَيْتُ رَسُولَ اللَّهِ ﷺ يُصَلِّي فَكَانَ إِذَا رَكَعَ سَوَّى ظَهْرَهُ حَتَّى لَوْ صُبَّ عَلَيْهِ الْمَاءُ لاَسْتَقَرَّ