Chapter on Making Up the Month of Ramadan, and the Ruling of One Who Breaks the Fast in It Intentionally and Forgetfully, and One upon Whom Fasting Two Consecutive Months Is Obligatory and He Breaks the Fast during Them, or upon Whom There Is a Vow Regarding Fasting

Tahdhīb al-Aḥkām|Volume 4|Book 2|Chapter 26

Tahdhīb al-Aḥkām

Volume 4, Book 2, Chapter 26

Chapter on Making Up the Month of Ramadan, and the Ruling of One Who Breaks the Fast in It Intentionally and Forgetfully, and One upon Whom Fasting Two Consecutive Months Is Obligatory and He Breaks the Fast during Them, or upon Whom There Is a Vow Regarding Fasting

Hadith #38

رَوَى مُحَمَّدُ بْنُ اَلْحَسَنِ اَلصَّفَّارُ عَنْ مُحَمَّدِ بْنِ عِيسَى عَنْ أَبِيهِ عَنِ اَلصَّيْقَلِ: أَنَّهُ كَتَبَ إِلَيْهِ أَيْضاً يَا سَيِّدِي رَجُلٌ نَذَرَ أَنْ يَصُومَ يَوْماً لِلَّهِ فَوَقَعَ فِي ذَلِكَ اَلْيَوْمِ عَلَى أَهْلِهِ مَا عَلَيْهِ مِنَ اَلْكَفَّارَةِ فَأَجَابَهُ» يَصُومُ يَوْماً بَدَلَ يَوْمٍ وَتَحْرِيرُ رَقَبَةٍ مُؤْمِنَةٍ«.

Muhammad ibn al-Hasan al-Saffar narrated, from Muhammad ibn Isa, from his father, from al-Sayqal: He (narrator) wrote to Imam : “My master, a man vowed to fast a day for Allah , then on that day he had intercourse with his wife. What expiation is upon him?” Imam answered him: “He fasts a day in place of a day, and frees a believing slave.”

Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 357