Al-Husayn ibn Said, from al-Qasim, from Ali, from Abu Basir, who said:
I (narrator) asked Abu Abdillah عليه السلام, peace be upon him, about ‘a man who spoke (lustfully) to his wife during the month of Ramadan while he was fasting, and then emitted semen.’ Imam عليه السلام said, “There is no harm.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 345