Sunan Abi Dawud, Hadith 224 ⓘ
‘A’ishah reported : When the Prophet (May peace be upon him) wanted to eat or sleep, he would perform ablution. She meant that (the prophet did so) when he was sexually defiled.
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، حَدَّثَنَا شُعْبَةُ، عَنِ الْحَكَمِ، عَنْ إِبْرَاهِيمَ، عَنِ الأَسْوَدِ، عَنْ عَائِشَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ إِذَا أَرَادَ أَنْ يَأْكُلَ أَوْ يَنَامَ تَوَضَّأَ . تَعْنِي وَهُوَ جُنُبٌ .
also referenced under: Hadith 224 (DarusSalam) & Book 1, Hadith 224 (USC-MSA)