[Machine] The Messenger of Allah ﷺ said: "A prayer in which a man does not establish his backbone firmly in the bowing and prostration does not count." Or he said, "When he bows and when he prostrates." Abu 'Awānah doubted (the correct wording).
قَالَ رَسُولُ اللهِ ﷺ «لَا تُجْزِئُ صَلَاةٌ لَا يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ» أَوْ قَالَ «إِذَا رَكَعَ وَإِذَا سَجَدَ» شَكَّ أَبُو عَوَانَةَ
"The Messenger of Allah ﷺ said: 'No prayer is valid in which a man does not maintain his back (at ease) when bowing and prostrating.'"
قَالَ رَسُولُ اللَّهِ ﷺ لاَ تُجْزِئُ صَلاَةٌ لاَ يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ
"The Messenger of Allah ﷺ said: 'The prayer is not valid if a man does not bring his backbone to rest while bowing and prostrating.'"
قَالَ رَسُولُ اللَّهِ ﷺ لاَ تُجْزِئُ صَلاَةٌ لاَ يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ
“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
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
“The Messenger of Allah ﷺ said: ‘No prayer is acceptable in which a man does not settle his spine when bowing and when prostrating.’” (Using translation from Ibn Mājah 870)
قَالَ رَسُولُ اللَّهِ ﷺ «لَا تُجْزِئُ صَلَاةٌ لَا يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ»
“The Messenger of Allah ﷺ said: ‘No prayer is acceptable in which a man does not settle his spine when bowing and when prostrating.’” (Using translation from Ibn Mājah 870)
قَالَ رَسُولُ اللَّهِ ﷺ «لَا تُجْزِئُ صَلَاةٌ لَا يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ»
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»
“The Messenger of Allah ﷺ said: ‘No prayer is acceptable in which a man does not settle his spine when bowing and when prostrating.’” (Using translation from Ibn Mājah 870)
قَالَ رَسُولُ اللهِ ﷺ «لَا تُجْزِئُ صَلَاةٌ لَا يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ»
“The Messenger of Allah ﷺ said: ‘No prayer is acceptable in which a man does not settle his spine when bowing and when prostrating.’” (Using translation from Ibn Mājah 870)
قَالَ رَسُولُ اللهِ ﷺ «لَا تُجْزِئُ صَلَاةٌ لَا يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ»
“The Messenger of Allah ﷺ said: ‘No prayer is acceptable in which a man does not settle his spine when bowing and when prostrating.’” (Using translation from Ibn Mājah 870)
قَالَ رَسُولُ اللهِ ﷺ لَا يُجْزِي صَلَاةٌ لَا يُقِيمُ الرَّجُلُ صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ
[Machine] "The Prophet ﷺ said that a prayer is not acceptable if a person does not maintain their stiffness (straightness) in the bowing and prostration, which is what Yahya ibn Abi Bukayr excelled in."
أَنَّ النَّبِيَّ ﷺ قَالَ لَا تُجْزِي صَلَاةٌ لَا يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ تَفَرَّدَ بِهِ يَحْيَى بْنُ أَبِي بُكَيْرٍ
“The Messenger of Allah ﷺ said: ‘No prayer is acceptable in which a man does not settle his spine when bowing and when prostrating.’” (Using translation from Ibn Mājah 870)
النَّبِيَّ ﷺ قَالَ لَا تُجْزِي صَلَاةٌ لَا يُقِيمُ الرَّجُلُ فِيهَا صُلْبَهُ فِي الرُّكُوعِ وَالسُّجُودِ
"لا تُجْزِيءُ صَلاةٌ لَا يُقِيمُ الرَّجلُ فيهَا صُلبَهُ في الرُّكُوع وَالسُّجُودِ".