Sahih al-Bukhari 282
صحيح البخاري#282Sahihحَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ أَخْبَرَنَا مَالِكٌ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ زَيْنَبَ بِنْتِ أَبِي سَلَمَةَ، عَنْ أُمِّ سَلَمَةَ أُمِّ الْمُؤْمِنِينَ، أَنَّهَا قَالَتْ جَاءَتْ أُمُّ سُلَيْمٍ امْرَأَةُ أَبِي طَلْحَةَ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَتْ يَا رَسُولَ اللَّهِ، إِنَّ اللَّهَ لاَ يَسْتَحْيِي مِنَ الْحَقِّ، هَلْ عَلَى الْمَرْأَةِ مِنْ غُسْلٍ إِذَا هِيَ احْتَلَمَتْ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " نَعَمْ إِذَا رَأَتِ الْمَاءَ ".
Narrated Um-Salama:(the mother of the believers) Um Sulaim, the wife of Abu Talha, came to Allah's Messenger (ﷺ) and said, "O Allah's Messenger (ﷺ)! Verily Allah is not shy of (telling you) the truth. Is it necessary for a woman to take a bath after she has a wet dream (nocturnal sexual discharge)?" Allah's Messenger (ﷺ) replied, "Yes, if she notices a discharge
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 5:34