Man Lā Yaḥḍuruh al-Faqīh
Hadith 3281899 - وَ سَأَلَهُ عَبْدُ اَللَّهِ بْنُ سِنَانٍ : عَنِ اَلرَّجُلِ يَقْضِي شَهْرَ رَمَضَانَ فَيُجْنِبُ مِنْ أَوَّلِ اَللَّيْلِ وَ لاَ يَغْتَسِلُ حَتَّى يَجِيءَ آخِرُ اَللَّيْلِ وَ هُوَ يَرَى أَنَّ اَلْفَجْرَ قَدْ طَلَعَ قَالَ «لاَ يَصُومُ ذَلِكَ اَلْيَوْمَ وَ يَصُومُ غَيْرَهُ ».
Hadith.1899 - Abdullah ibn Sinan asked Imam (as) about a man who is making up a fast for the Month of Ramadan. He becomes junub (in a state of ritual impurity) at the beginning of the night but does not perform ghusl until the end of the night, thinking that dawn has already broken.
Imam (as) said: "He should not fast that day but should fast on another day."