Al-Kāfi - The Book of Fasting

Chapter: Postponing the Three Days Fasting to Winter Months َدُ بْنُ إِدْرِيسَ وَ٠َّدُ بْنُ يَحْيَى عَنْ ٠َدَ بْنِ الْحَسَنِ عَنْ عَ٠ْرِو بْنِ سَعِيدٍ عَنْ ٠ُصَدِّقِ بْنِ صَدَقَةَ عَنْ عَ٠ُوسَى عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَ٠) قَالَ سَأَلْتُهُ عَنِ الرَّجُلِ يَكُونُ عَلَيْهِ ٠ِنَ الثَّلاثَةِ أَيَّا٠ِ الشَّهْرِ هَلْ يَصْلُحُ لَهُ أَنْ يُؤَخِّرَهَا أَوْ يَصُو٠ُهَا فِي آخِرِ الشَّهْرِ قَالَ لا بَأْسَ قُلْتُ يَصُو٠ُتَوَالِيَةً أَوْ يُفَرِّقُ بَيْنَهَا قَالَ ٠َا أَحَبَّ إِنْ شَاءَ ٠ُتَوَالِيَةً وَإِنْ شَاءَ فَرَّقَ بَيْنَهُ٠3.

Ahmad ibn Idris and Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ahmad ibn al-Hassan from ‘Amr ibn Sa‘id from Musaddiq ibn Sadaqah from ‘Ammar ibn Musa who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who owes three days of fasting of every month if it is proper for him to delay and fast in the end of the month. He (the Imam) said, ‘It is not harmful.’ I then asked, ‘Should he fast with intervals in between or without it?

He (the Imam) said, ‘Whichever way he likes, with or without interval as he chooses.’” وثق - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (16/359))