Ahmed bin 'Amr bin al-Sarh أحمد بن عمرو بن السرح أبو الطاهر · The Book of Purification

It was narrated from 'Abdullah bin Mas'ud, that the Messenger of Allah (ﷺ) forbade cleaning oneself with bones or dung.

"Uthman called for water for Wudu'. He washed his hands three times, then he rinsed his mouth and nose, then he washed his face three times, then washed his right hand up to the elbow three times. Then he washed his left hand likewise. Then he washed his left hand likewise. Then he wiped his head, then he washed his right foot up to the ankle three times, and he washed his left foot likewise, and he washed his left…