(8) باب مَسْحِ الْيَدِ بِالتُّرَابِ لِيَكُونَ أَنْقَى
Narrated Maimuna:
The Prophet (ﷺ) took the bath of Janaba. (sexual relation or wet dream). He first cleaned his private parts with his hand, and then rubbed it (that hand) on the wall (earth) and washed it. Then he performed ablution like that for the prayer, and after the bath he washed his feet.
Reference: Sahih al-Bukhari 260
In-book reference: Book 5, Hadith 13
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 5, Hadith 260