[Machine] He heard the Prophet ﷺ say, "Allah does not look at the prayer of a servant who does not straighten his backbone between the bowing and prostration."  

أَنَّهُ سَمِعَ النَّبِيَّ ﷺ يَقُولُ لَا يَنْظُرُ اللهُ إِلَى صَلَاةِ عَبْدٍ لَا يُقِيمُ صُلْبَهُ بَيْنَ رُكُوعِهِ وَسُجُودِهِ  

[Machine] He said, "I prayed behind the Messenger of Allah ﷺ , then he left and saw a man praying alone behind the row. The Prophet ﷺ stood there until the man finished his prayer, then he said to him, 'Face your prayer, as there is no prayer for an individual behind the row.'"  

أَنَّهُ قَالَ صَلَّيْتًُ خَلْفَ رَسُولِ اللهِ ﷺ فَانْصَرَفَ فَرَأَى رَجُلًا يُصَلِّي فَرْدًا خَلْفَ الصَّفِّ فَوَقَفَ نَبِيُّ اللهِ ﷺ حَتَّى انْصَرَفَ الرَّجُلُ مِنْ صَلَاتِهِ فَقَالَ لَهُ اسْتَقْبَلْ صَلَاتَكَ فَلَا صَلَاةَ لِفَرْدٍ خَلْفَ الصَّفِّ  

[Machine] I heard the Messenger of Allah ﷺ saying, "Indeed, Allah does not look at a man who does not keep his back straight in his bowing and prostration."  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ إِنَّ اللهَ لَا يَنْظُرُإِلَى رَجُلٍ لَا يُقِيمُ صُلْبَهُ فِي رُكُوعِهِ وَفِي سُجُودِهِ