It is narrated from Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) that he fell ill, and when he recovered he said: "O people! I have not fallen short in sincere goodwill towards you. I heard the Messenger of Allah (peace and blessings be upon him) say: 'The Dajjal will emerge from a land in the east called Khurasan; he will be followed by people whose faces are like (broad) shields.'"
Imam Abu Ya'la (may Allah have mercy on him) said: "These are the words of Ibn Kathir's narration, and Harun did not narrate it in full as al-Dawraqi narrated it in full."
Hadith Referenceمسند أبي يعلى الموصلي / مسند أبي بكر الصديق رضي الله عنه / 35