مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3662
Musnad of Abdullah bin Mas'ood
It was narrated that ‘Abdullah (رضي الله عنه) said: The Prophet (ﷺ) went out to relieve himself and he said to me: "Find me three stones,” I brought him two stones and a piece of dung; he took the two stones and threw the piece of dung away, and he said: "It is dirt."
Musnad Ahmad 3685Saheeh because of corroborating evidence; this is a da'eef i