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 #39

مُحَمَّدُ بْنُ يَعْقُوبَ عَنْ مُحَمَّدِ بْنِ جَعْفَرٍ اَلرَّزَّازِ عَنِ اِبْنِ عِيسَى عَنِ اِبْنِ مَهْزِيَارَ: أَنَّهُ كَتَبَ إِلَيْهِ يَسْأَلُهُ يَا سَيِّدِي رَجُلٌ نَذَرَ أَنْ يَصُومَ يَوْماً بِعَيْنِهِ فَوَقَعَ فِي ذَلِكَ اَلْيَوْمِ عَلَى أَهْلِهِ مَا عَلَيْهِ مِنَ اَلْكَفَّارَةِ فَكَتَبَ عَلَيْهِ اَلسَّلاَمُ إِلَيْهِ» يَصُومُ يَوْماً بَدَلَ يَوْمٍ وَتَحْرِيرُ رَقَبَةٍ مُؤْمِنَةٍ«.

Muhammad ibn Yaqub narrated from Muhammad ibn Jafar al-Razzaz, from Ibn Isa, from Ibn Mahziyar: Ibn Mahziyar wrote to Imam : “O my master, a man vowed to fast a specific day, but on that day he had intercourse with his wife. What expiation is required of him?” Imam wrote to him: "He must fast one day in place of that day and free a believing slave.”

Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 358