مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ هِشَامِ بْنِ سَالِمٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَبِي جَعْفَرٍ ع قَالَ:
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إِنَّ الْعَبْدَ لَيُرْفَعُ لَهُ مِنْ صَلَاتِهِ نِصْفُهَا أَوْ ثُلُثُهَا أَوْ رُبُعُهَا أَوْ خُمُسُهَا فَمَا يُرْفَعُ لَهُ إِلَّا مَا أَقْبَلَ عَلَيْهِ بِقَلْبِهِ وَ إِنَّمَا أَمَرْنَا بِالنَّافِلَةِ لِيَتِمَّ لَهُمْ بِهَا مَا نَقَصُوا مِنَ الْفَرِيضَةِ.
Read English translationHide English translationMuhammad Sarwar — attributed by Thaqalayn
2. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ibn Abi ‘Umayr Hisham ibn Salim from Muhammad ibn Muslim who has said the following: “Abu Ja‘far (a.s.), has said, ‘Of Salah (prayer) of a servant (of Allah) sometimes one-half, sometimes one-third, one-fourth or one-fifth is raised. Whatever is raised is only what one has performed with love from his heart. We only command to perform optional Salah (prayer) to complete what it is cut short of obligatory ones.’”
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 (15/234)