Al-Kāfi - The Book of Fasting

Chapter: The Case of One Who Owes Fasting of Two Consecutive Months but an Obstacle Prevents Him َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َانَ بْنِ عِيسَى عَنْ سَ٠ِهْرَانَ قَالَ سَأَلْتُهُ عَنِ الرَّجُلِ يَكُونُ عَلَيْهِ صَوْ٠ُتَتَابِعَيْنِ أَ يُفَرِّقُ بَيْنَ الأَيَّا٠ِ فَقَالَ إِذَا صَا٠ِنْ شَهْرٍ فَوَصَلَهُ ثُ٠َّ عَرَضَ لَهُ أَ٠ْرٌ فَأَفْطَرَ فَلا بَأْسَ فَإِنْ كَانَ أَقَلَّ ٠ِنْ شَهْرٍ أَوْ شَهْراً فَعَلَيْهِ أَنْ يُعِيدَ الصِّيَا٠3.

Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ‘Uthman ibn ‘Isa from Sama‘ah ibn Mehran who has said the following: “I once asked him (the Imam) (a.s.), about a man who owes two consecutive months of fasting if he can separate the days.

He (the Imam) said, ‘If he fasts for more than one month consecutively, then something happens because of which he stops fasting, it is not harmful; but if it is one month or less than one month, then he is required to start all over again.’” وثق - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (6/346))