The Prophet ﷺ said: A man's prayer does not avail him unless he keeps his back steady when bowing and prostrating. (Using translation from Abū Dāʾūd 855)

قَالَ رَسُولُ اللهِ ﷺ لَا تُجْزِئُ صَلَاةٌ لِأَحَدٍ لَا يُقِيمُ فِيهَا ظَهْرَهُ فِي الرُّكُوعِ وَالسُّجُودِ

[AI] I heard the Prophet ﷺ saying, "I have started bowing, so whoever missed my bowing should complete it during my slow standing." And Abdur-Razzaq said regarding my slow standing.

سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ إِنِّي قَدْ بَدُنْتُ فَمَنْ فَاتَهُ رُكُوعِي أَدْرَكَهُ فِي بُطْءِ قِيَامِي وَقَالَ عَبْدُ الرَّزَّاقِ فِي بَطِيءِ قِيَامِي

The Prophet ﷺ said: A man's prayer does not avail him unless he keeps his back steady when bowing and prostrating. (Using translation from Abū Dāʾūd 855)

قَالَ رَسُولُ اللَّهِ ﷺ «لَا تُجْزِئُ صَلَاةٌ لِأَحَدٍ لَا يُقِيمُ صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ»

[AI] The Messenger of Allah ﷺ said, "I have already made the intention to sit, so do not rush me to stand during prayer, and during bowing and prostration."

قَالَ رَسُولُ اللهِ ﷺ «إِنِّي قَدْ بَدَّنْتُ فَلَا تُبَادِرُونِي بِالْقِيَامِ فِي الصَّلَاةِ وَالرُّكُوعِ وَالسُّجُودِ»

"إِنِّى قدْ بَدَّنْتُ فَلا تَسْبِقُونِى بِالرُّكُوع والسِّجودِ".

"إِنِّى امْرُؤٌ قد بَدَّنْتُ، فَلا تُبَادِرُونى بالْقِيَامِ فِى الصَّلَاه والرُّكُوع والسُّجُود" .

"إِنِّى قَدْ بَدَّنْتُ فَمَنْ فَاتَهُ الرُّكُوعُ أَدْرَكَنِى فِى بَطِئِ قَيامِى" .

"بَدُنْتُ، فَمَنْ فَاتَهُ رُكُوعِى أَدْرَكَهُ فِي بُطْء قيامى".