Musannaf Ibn Abi Shayba 37:377

Al-Mu'alla ibn Mansur narrated to us, he said: 'Abd al-Wahid ibn Ziyad narrated to us, he said: Al-Harith ibn Hasirah narrated to us, from Zayd ibn Wahb, who said: I heard Abu Dharr saying: "That I should swear ten times that Ibn Sayyad is the Dajjal is more beloved to me than that I should swear once that he is not him." And that is because of something I heard from the Messenger of Allah (may Allah bless him and grant him peace). The Messenger of Allah (may Allah bless him and grant him peace) sent me to the mother of Ibn Sayyad and said: "Ask her how long she carried him." She said: "I carried him for twelve months." So I came to him and informed him. He said: "Ask her: did he cry when he was born?" She said: "He cried like a two-month-old infant." He said: And the Messenger of Allah (may Allah bless him and grant him peace) said to him: "I have hidden something for you." He said: "You have hidden for me a dusty-colored sheep's bone." And he intended to say "the smoke" (al-dukhan), so the Messenger of Allah (may Allah bless him and grant him peace) said: "Be off! For you will never exceed your destiny."