Musnad Ahmad 286:5

Rawh narrated to us, he said: Sa'id ibn Abi 'Arubah and 'Abd al-Wahhab narrated to us, from Sa'id, from Qatadah, from Abu al-Tufayl, from Hudhayfah ibn Asid al-Ghifari, that the Messenger of Allah, may Allah bless him and grant him peace, was informed of the death of the Negus. He said: "Pray for a brother of yours in a land other than your own."