Mishkat al-Masabih #490

Abul Juhaim b. al-Harith b. as-Simma said, “I came upon the Prophet when he was passing water and saluted him, but he did not reply till he got up and went to a wall, and after scraping it with a stick which he had, he put his hands on the wall and wiped his face and his forearms; then he replied to my salutation.” I have not found this version in the two Sahihs, or in al-Humaidi’s book; but Baghawi mentioned it in Sharh as-sunna, saying that this is a hasan tradition.