The Book of Purification
1/131. Chapter:
The Ghusl Of A Woman Who Sees Something In Her dream Like A Man Sees
Sunan an-Nasai
أَخْبَرَنَا يُوسُفُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا حَجَّاجٌ، عَنْ شُعْبَةَ، قَالَ سَمِعْتُ عَطَاءً الْخُرَاسَانِيَّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ خَوْلَةَ بِنْتِ حَكِيمٍ، قَالَتْ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنِ الْمَرْأَةِ تَحْتَلِمُ فِي مَنَامِهَا فَقَالَ " إِذَا رَأَتِ الْمَاءَ فَلْتَغْتَسِلْ " .
It was narrated that Khawlah bin Hakim said: "I asked the Messenger of Allah (ﷺ) about a woman who has a wet dream and he said: 'If she sees water, let her perform Ghusl.'"
Reference : Sunan an-Nasa'i 198In-book reference : Book 1, Hadith 199English translation : Vol. 1, Book 1, Hadith 198