حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، عَنْ حُسَيْنٍ الْمُعَلِّمِ، عَنْ بُدَيْلٍ، عَنْ أَبِي الْجَوْزَاءِ، عَنْ عَائِشَةَ، قَالَتْ كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ إِذَا رَكَعَ لَمْ يَشْخَصْ رَأْسَهُ وَلَمْ يُصَوِّبْهُ، وَلَكِنْ بَيْنَ ذَلِكَ ‏.‏
Translation
It wasnarrated that ‘Ali bin Shaiban who was part of a delegation(to theProphet (ﷺ)) said

“We set out until we came to theMessenger ofAllah (ﷺ), and we gave him our oath of allegiance andperformedprayer behind him. He glanced out of the corner of his eyeat a manwho was not settling his spine when he bowed and prostrated.When theProphet (ﷺ) finished the prayer, he said: ‘O Muslims, thereis noprayer for the one who does not settle his spine when bowing andprostrating.’”