Musnad Abu Ya'la al-Mawsili 1:34

Abu Musa Harun ibn Abdullah narrated to us, Abu Usamah narrated to us, al-Fazari—meaning Abu Ishaq—narrated to me, from Abdullah ibn Shawdhab. And al-Dawraqi narrated to us, Ibn Abi Ghuniyah, the son-in-law of Abu Ishaq, narrated to us, Abu Ishaq al-Fazari narrated to us, from Abdullah ibn Shawdhab, from Abu al-Tayyah, from al-Mughirah ibn Subay’, from Amr ibn Hurayth, from Abu Bakr. And al-Dawraqi narrated to us, Muhammad ibn Kathir narrated to us, from Ibn Shawdhab, from Abu al-Tayyah, from al-Mughirah ibn Subay’, from Amr ibn Hurayth, from Abu Bakr al-Siddiq, that he fell ill. When it (the illness) subsided from him, he said: "O people, I have not spared you any sincere advice. I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: 'The Dajjal will emerge from a land in the East called Khurasan, followed by people whose faces are like hammered shields.'" The wording is that of the hadith of Ibn Kathir, and Harun did not complete it as al-Dawraqi completed it.