Sunan an Nasai
The Book of Purification
Hadith #196
1.196
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا عَبْدَةُ، قَالَ حَدَّثَنَا سَعِيدٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، أَنَّ أُمَّ سُلَيْمٍ، سَأَلَتْ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنِ الْمَرْأَةِ تَرَى فِي مَنَامِهَا مَا يَرَى الرَّجُلُ قَالَ " إِذَا أَنْزَلَتِ الْمَاءَ فَلْتَغْتَسِلْ " .
It was narrated from Anas that Umm Sulaim asked the Messenger of Allah (ﷺ) about a woman who sees in her dream something like a man sees. He said:"If water is released then let her perform Ghusl