Musannaf Ibn Abi Shayba 27:29

Ghundar narrated to us, from Shu'bah, from 'Amr ibn Murrah, from Murrah, from a man among the companions of the Prophet, may Allah bless him and grant him peace, who said: The Messenger of Allah, may Allah bless him and grant him peace, stood among us and said: "Indeed, I am your forerunner to the Basin (al-Hawd)."