Musnad Ahmad 595:12

Hassan narrated to us, Ibn Lahi'ah narrated to us, he said: Abdullah ibn Hubayrah narrated to us, from Abd al-Rahman ibn Jubayr, he said: I was in a gathering in which were al-Mustawrid ibn Shaddad and Amr ibn Ghaylan, and I heard al-Mustawrid saying: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Whoever is appointed by us to a task," and he mentioned the like of the hadith of al-Harith.