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

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

وَ عَنْهُ عَنْ حَمَّادٍ عَنْ عَبْدِ اَللَّهِ بْنِ اَلْمُغِيرَةِ عَنِ اِبْنِ سِنَانٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ:» مَنْ أَفْطَرَ شَيْئاً مِنْ شَهْرِ رَمَضَانَ فِي عُذْرٍ فَإِنْ قَضَاهُ مُتَتَابِعاً فَهُوَ أَفْضَلُ وَ إِنْ قَضَاهُ مُتَفَرِّقاً فَحَسَنٌ«.

And from him, from Hammad, from Abdullah ibn al-Mughirah, from Ibn Sinan, from Abu Abdillah , peace be upon him: Imam said: “Whoever breaks the fast for any part of the month of Ramadan due to an excuse, then if he makes it up consecutively, it is better, and if he makes it up separately, that is good.”

Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 345
Shaykh Baqir al-Behbudi
Ṣaḥīḥ al-Tahdhīb, p. 375

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

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 #2