Narrated 'Aishah and Umm Salamah, wives of the Prophet (ﷺ):

The Messenger of Allah (ﷺ) would be overtaken by the dawn when he was in a state of sexual defilement. The narrator 'Abd Allah al-Adhrami said in his version: During Ramadan, due to sexual intercourse and no owing to a dream (i.e. nocturnal emission), and would fast. Abu Dawud said: How brief is this sentence uttered by the narrator, this is, "he was overtaken by daw when he was in the state of sexual defilement"? The tradition says: The Prophet (ﷺ) was overtaken by dawn in the state of sexual defilement when he was fasting.

حَدَّثَنَا الْقَعْنَبِيُّ، عَنْ مَالِكٍ، ح وَحَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدِ بْنِ إِسْحَاقَ الأَذْرَمِيُّ، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ، عَنْ مَالِكٍ، عَنْ عَبْدِ رَبِّهِ بْنِ سَعِيدٍ، عَنْ أَبِي بَكْرِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ الْحَارِثِ بْنِ هِشَامٍ، عَنْ عَائِشَةَ، وَأُمِّ سَلَمَةَ زَوْجَىِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُمَا قَالَتَا كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُصْبِحُ جُنُبًا ‏.‏ قَالَ عَبْدُ اللَّهِ الأَذْرَمِيُّ فِي حَدِيثِهِ فِي رَمَضَانَ مِنْ جِمَاعٍ غَيْرِ احْتِلاَمٍ ثُمَّ يَصُومُ ‏.‏ قَالَ أَبُو دَاوُدَ وَمَا أَقَلَّ مَنْ يَقُولُ هَذِهِ الْكَلِمَةَ - يَعْنِي يُصْبِحُ جُنُبًا فِي رَمَضَانَ - وَإِنَّمَا الْحَدِيثُ أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يُصْبِحُ جُنُبًا وَهُوَ صَائِمٌ ‏.‏