[Machine] I once lost consciousness (or fainted) for a day, and when I woke up, I was fasting. So, I went to the Messenger of Allah ﷺ and said, "I did something great while I was fasting." The Messenger of Allah ﷺ asked, "Did you rinse your mouth with water while fasting?" I replied, "There is no harm in that." The Messenger of Allah ﷺ asked, "With what?" Abu 'Abd al-Rahman replied, "This is an unknown hadith, narrated by Bukayr, Mamun, and 'Abd al-Malik ibn Sa'id, but we do not know who said it."  

هَشِشْتُ يَوْمًا فَقَبَّلْتُ وَأَنَا صَائِمٌ فَأَتَيْتُ رَسُولَ اللهِ ﷺ فَقُلْتُ صَنَعْتُ أَمْرًا عَظِيمًا قَبَّلْتُ وَأَنَا صَائِمٌ قَالَ رَسُولُ اللهِ ﷺ «أَرَأَيْتَ لَوْ تَمَضْمَضْتَ بِمَاءٍ وَأَنْتَ صَائِمٌ؟» فَقُلْتُ لَا بَأْسَ بِذَلِكَ قَالَ رَسُولُ اللهِ ﷺ «فَفِيمَ؟» قَالَ أَبُو عَبْدِ الرَّحْمَنِ «وَهَذَا حَدِيثٌ مُنْكَرٌ وَبُكَيْرٌ مَأْمُونٌ وَعَبْدُ الْمَلِكِ بْنُ سَعِيدٍ رَوَاهُ عَنْهُ غَيْرُ وَاحِدٍ وَلَا نَدْرِي مِمَّنْ هَذَا»