Musnad Ahmad 30:787

Yazid narrated to us, Mas'udi informed us. And Abu al-Nadr said: Mas'udi narrated to us, the meaning, from 'Asim ibn Kulayb, from his father, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I came out to you, and the Night of Decree (Laylat al-Qadr) and the False Messiah (Masih al-Dalalah) had been made clear to me. Then there was a dispute between two men in the courtyard of the mosque, so I came to them to separate them, and I was made to forget them (the knowledge of their specific times). I will tell you something about them: As for the Night of Decree, seek it in the last ten nights, on the odd-numbered ones. And as for the False Messiah, he is one-eyed, with a broad forehead, broad chest, and he has a stoop, as if he were Qatan ibn 'Abd al-'Uzza." He (the man) said: "O Messenger of Allah, will his resemblance harm me?" He said: "No, you are a Muslim man, and he is a disbelieving man."