وَ رَوَى مُحَمَّدُ بْنُ مُسْلِمٍ عَنْ أَبِي جَعْفَرٍ ع قَالَ:
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قُلْتُ لَهُ رَجُلٌ مَرِضَ فَتَرَكَ النَّافِلَةَ فَقَالَ يَا مُحَمَّدُ لَيْسَتْ بِفَرِيضَةٍ إِنْ قَضَاهَا فَهُوَ خَيْرٌ يَفْعَلُهُ وَ إِنْ لَمْ يَفْعَلْ فَلَا شَيْءَ عَلَيْهِ.
English translationBab Ul Qaim Publications
Hadith.1431 - Muhammad ibn Muslim narrates that Imam Muhammad ibn Ali Al-Baqir (as) said: "I asked him about a man who became ill and thus did not perform the supererogatory (nafilah) prayers. Imam (as) said: 'O’ Muhammad, they are not obligatory. If he makes them up, it is a good deed he performs, and if he does not, there is no obligation upon him.'"
Translation: Bab Ul Qaim Publications·Thaqalayn link·The Arabic above is the original.