[Machine] We used to pray behind the Messenger of Allah ﷺ , and when he lifted his head from bowing, none of us would straighten his back until the Prophet ﷺ prostrated. Then we would prostrate.
كُنَّا إِذَا صَلَّيْنَا خَلْفَ رَسُولِ اللهِ ﷺ فَرَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ لَمْ يَحْنِ رَجُلٌ مِنَّا ظَهْرَهُ حَتَّى يَسْجُدَ النَّبِيُّ ﷺ فَنُسْجَدَ