He said, the Messenger of Allah ﷺ forbade cleaning oneself with a bone or with dung.
قال نهى رسول الله ﷺ أن يتمسح بعظم أو يبعر.
No references are available.
Reported by Muslim in the Book of Purification (263), from Abu Zubayr, that he heard Jabir say, and he mentioned it.