Musannaf Ibn Abi Shayba 37:159

Abu Usama narrated to us, he said: Ibn 'Awn narrated to us, from Ibn Sirin, who said: Muhammad ibn Abi Hudhayfah was with Ka'b on a ship. He said to Ka'b one day: "O Ka'b, do you find this in the Torah—how it flows, and how, and how?" Ka'b said to him: "Do not mock the Torah, for it is the Book of Allah, and there is only truth in it." He said: So he returned and said to him the same thing, and he returned and said to him the same thing. Then he said: "However, I find in it that a man from Quraysh, with protruding canine teeth, will leap into the tribulation (fitna) just as a donkey leaps in its tether. So fear Allah, and do not let it be you." Muhammad said: And it was him.