Sunan Ibn Majah 581
سنن ابن ماجه#581Sahihحَدَّثَنَا مُحَمَّدُ بْنُ الصَّبَّاحِ، حَدَّثَنَا أَبُو بَكْرِ بْنُ عَيَّاشٍ، عَنِ الأَعْمَشِ، عَنْ أَبِي إِسْحَاقَ، عَنِ الأَسْوَدِ، عَنْ عَائِشَةَ، قَالَتْ كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ يُجْنِبُ ثُمَّ يَنَامُ وَلاَ يَمَسُّ مَاءً حَتَّى يَقُومَ بَعْدَ ذَلِكَ فَيَغْتَسِلَ .
It was narrated that 'Aishah said:"The Messenger of Allah would become sexually impure and then sleep without water until he got up later on and taken a bath
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:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Zubair Ali ZaiDaif
In-book reference: 1:315