Musnad Ahmad 33:304

Yahya narrated to us, from Ibn Jurayj, who said: Abu al-Zubayr informed me that he heard Jabir saying: I saw the Prophet, may Allah bless him and grant him peace, throwing [pebbles] while upon his mount on the Day of Sacrifice. He was saying: "Take your rites [of Hajj] from me, for I do not know, perhaps I will not perform Hajj after this Hajj of mine."