Musannaf Ibn Abi Shayba 23:188

Abu Mu'awiyah narrated to us, from al-A'mash, from Muslim, from Masruq, who said: Suhayb passed by Abu Bakr and he turned away from him. He said: "What is the matter with you that you turned away from me? Has something reached you that you dislike?" He said: "No, by Allah, except for a vision I saw which I disliked." He said: "And what did you see?" He said: "I saw your hand shackled to your neck at the door of a man from the Ansar who is called Abu al-Hashr." Abu Bakr said: "How excellent is what you saw; my religion has been gathered for me until the Day of Gathering (al-Hashr)."