Al-Kāfi

Hadith 464
fasting
2ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ وَمُحَمَّدُ بْنُ إِسْمَاعِيلَ عَنِ الْفَضْلِ بْنِ شَاذَانَ جَمِيعاً عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ جَمِيلٍ عَنْ زُرَارَةَ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ السَّلاَم) فِي الرَّجُلِ يَمْرَضُ فَيُدْرِكُهُ شَهْرُ رَمَضَانَ وَيَخْرُجُ عَنْهُ وَهُوَ مَرِيضٌ وَلا يَصِحُّ حَتَّى يُدْرِكَهُ شَهْرُ رَمَضَانٍ آخَرُ قَالَ يَتَصَدَّقُ عَنِ الأَوَّلِ وَيَصُومُ الثَّانِيَ فَإِنْ كَانَ صَحَّ فِيمَا بَيْنَهُمَا وَلَمْ يَصُمْ حَتَّى أَدْرَكَهُ شَهْرُ رَمَضَانٍ آخَرُ صَامَهُمَا جَمِيعاً وَيَتَصَدَّقُ عَنِ الأَوَّلِ.
2. Ali ibn Ibrahim has narrated from his father from and Muhammad ibn ‘Isma‘il has narrated from al-Fadl ibn Shadhan from all Ibn Abi ‘Umayr from Jamil from Zurarah who has said the following: “I once asked abu Ja‘far (a.s.), about a man who is ill. The month of Ramadan comes and he remains ill until the next month of Ramadan. He (the Imam) said, ‘He pays charity for the first month of Ramadan and fasts the second month of Ramadan. If in between he had become well but did not fast until the next month of Ramadan, he fasts for both and pays charity for the first month of Ramadan.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī