حَدَّثَنَا الْحَسَنُ بْنُ شَوْكَرٍ، حَدَّثَنَا هُشَيْمٌ، عَنْ عُرْوَةَ الْهَمْدَانِيِّ، حَدَّثَنَا الشَّعْبِيُّ، قَالَ قَالَتْ عَائِشَةُ رضى الله عنها لَئِنْ شِئْتُمْ لأُرِيَنَّكُمْ أَثَرَ يَدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي الْحَائِطِ حَيْثُ كَانَ يَغْتَسِلُ مِنَ الْجَنَابَةِ ‏.‏

Narrated Aisha, Ummul Mu'minin: If you want, I can certainly show you the marks of the hand of the Messenger of Allah (PBUH) on the wall where he took a bath because of sexual defilement. Translation Not Available

Book Ref: Sunan Abi Dawud Book 1 Hadith 244
Web Ref:  Sunan Abi Dawud Book 1 Hadith 244