Sunan Ibn Majah
Sunan Ibn Majah 1704
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ نُمَيْرٍ، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، قَالَ سَأَلْتُ أُمَّ سَلَمَةَ عَنِ الرَّجُلِ، يُصْبِحُ، وَهُوَ جُنُبٌ، يُرِيدُ الصَّوْمَ؟ قَالَتْ: كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ يُصْبِحُ جُنُبًا مِنَ الْوِقَاعِ، لاَ مِنِ احْتِلاَمٍ، ثُمَّ يَغْتَسِلُ وَيُتِمُّ صَوْمَهُ .
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Ali ibn Muhammad narrated to us; Abdullah ibn Numayr narrated to us, from Ubaydullah, from Nafi‘, who said: I asked Umm Salamah about a man who wakes up in a state of major ritual impurity while intending to fast. She said: ‘The Messenger of Allah (peace and blessings be upon him) would wake up in a state of major ritual impurity from intercourse, not from a wet dream. Then he would perform ghusl and complete his fast.’
Notes and open questions — unreviewed
The source explicitly contrasts impurity resulting from intercourse with that resulting from a wet dream; both are kept in the translation.