Whenever the Messenger of Allah ﷺ went out to relieve himself, another boy and I would bring him a water vessel and a short spear, and he would cleanse himself.
حدثنا يزيد بن هارون أخبرنا شعبة عن عطاء بن أبي ميمونة
كان رسول الله ﷺ إذا خرج للغائط أتيته أنا وغلام بإداوة وعنزة فاستنجى
No references are available.
Its chain of transmission is sahih, it has already passed at number 12039.