I followed the Prophet (ﷺ) while he was going out to answer the call of nature. He used not to look this way or that. So, when I approached near him he said to me, "Fetch for me some stones for cleaning the private parts (or said something similar), and do not bring a bone or a piece of dung [1]." So I brought the stones in the corner of my garment and placed them by his side and I then went away from him. When he finished (from answering the call of nature) he used them. [1:157-O.B.]