[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