Sahih Muslim 1859a, b

Hamid ibn Umar narrated this to us; Abu Awanah narrated to us, from Tariq, from Said ibn al-Musayyab, who said: My father was among those who pledged allegiance to the Messenger of Allah, peace and blessings be upon him, beneath the Tree. He said: The following year we set out as pilgrims, but the place was unclear to us. If it has become clear to you, then you know better. Muhammad ibn Rafi narrated this to me; Abu Ahmad narrated to us. He said: I read it to Nasr ibn Ali, from Abu Ahmad. Sufyan narrated to us, from Tariq ibn Abd al-Rahman, from Said ibn al-Musayyab, from his father, that they were with the Messenger of Allah in the year of the Tree, but forgot its location the following year.