The Sufficient (Vol 4) · Hadith 397 (#Ḥadīth #4)
Chapter 24 | The Case of One Who Experiences a Wet-Dream During the Night in the Month of Ramadan or at Other Times and Does Not Shower before Dawn or It Occurs During the Night or Day
4ـ أَحْمَدُ بْنُ مُحَمَّدٍ عَنِ الْحَجَّالِ عَنِ ابْنِ سِنَانٍ قَالَ كَتَبَ أَبِي إِلَى أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) وَكَانَ يَقْضِي شَهْرَ رَمَضَانَ وَقَالَ إِنِّي أَصْبَحْتُ بِالْغُسْلِ وَأَصَابَتْنِي جَنَابَةٌ فَلَمْ أَغْتَسِلْ حَتَّى طَلَعَ الْفَجْرُ فَأَجَابَهُ (عَلَيْهِ السَّلاَم) لا تَصُمْ هَذَا الْيَوْمَ وَصُمْ غَداً.
4. Ahmad ibn Muhammad has narrated from al-Hajjal from ibn Sinan who has said the following: “My father, once, when doing Qada’ (compensatory fast) of the fast of the month of Ramadan, wrote to abu ‘Abd Allah , and asked, ‘I, up till the morning, had Ghusl (bath); then experienced sexual relation (because of which Ghusl (bath) is obligatory) and I did not do Ghusl (bath) until it was dawn. He (the Imam) said, ‘Do not fast that day, fast the next day.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).