Musnad Ahmad 286:6

'Abd al-Samad and Azhar ibn al-Qasim narrated to us, they said: al-Muthanna narrated to us, Qatadah narrated to us, from Abu al-Tufayl, from Hudhayfah ibn Asid, that the Messenger of Allah (peace and blessings of Allah be upon him) went out to them one day and said: "Pray for your companion; he has died in a land other than yours." They said: "Who is he, O Messenger of Allah?" He said: "Sahmah, the Negus." Azhar said: "Sahmah." And Azhar said: Abu al-Tufayl al-Laythi, from Hudhayfah ibn Asid al-Ghifari.