مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنْ فَضَالَةَ بْنِ أَيُّوبَ عَنْ أَبِي الْمَغْرَاءِ عَنْ أَبِي بَصِيرٍ عَنْ أَبِي عَبْدِ اللَّهِ ع قَالَ
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قَالَ أَمِيرُ الْمُؤْمِنِينَ ص مَنْ لَمْ يُقِمْ صُلْبَهُ فِي الصَّلَاةِ فَلَا صَلَاةَ لَهُ.
Read English translationHide English translationMuhammad Sarwar — attributed by Thaqalayn
4. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from al-Husayn ibn Sa‘id from Fadalah ibn Ayyub from abu al- Mighra’ from abu Basir who has said the following: “Abu ‘Abd Allah (a.s.), has said that ’Amir al-Mu’minin has said, ‘One who does not straighten his back during Salah (prayer), his Salah (prayer) is not valid.’”
Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.
Hadith gradings
1- صحيحAllamah Baqir al-MajlisiMirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/125)