Musnad Ahmad 435:58

Abdullah said, and Amr ibn Muhammad al-Naqid narrated to me, saying: Abu Ahmad al-Zubayri narrated to us, Sufyan narrated to us, from Ja'far ibn Muhammad, from his father, from Ibn Abbas, from Mu'awiyah, who said: "I shortened the hair of the Messenger of Allah, peace and blessings of Allah be upon him, at al-Marwah."