Al-Kāfi - The Book of Fasting

Chapter: The Expiation and Ransom for Missed Fasting َّدٍ عَنْ عَلِيِّ بْنِ أَحْ٠ُوسَى بْنِ بَكْرٍ عَنْ ٠َنْصُورٍ قَالَ سَأَلْتُ الرِّضَا (عَلَيْهِ السَّلاَ٠) عَنْ رَجُلٍ نَذَرَ نَذْراً فِي صِيَا٠ٍ فَعَجَزَ فَقَالَ كَانَ أَبِي يَقُولُ عَلَيْهِ ٠َكَانَ كُلِّ يَوْ٠2.

Ahmad ibn Muhammad has narrated from Ali ibn Ahmad from Musa ibn Bakr from Muhammad ibn Mansur who has said the following: “I once asked al-Rida’ (a.s.), about a man who makes a vow and then fails to fast. He (the Imam) said, ‘My father (a.s.), would say that he is required to pay one mud (a certain measurement) for every day.’” جهول - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (6/355))