Musannaf Ibn Abi Shayba 37:358

Yazid ibn Harun narrated to us, he said: Ibn 'Awn informed us, from Mujahid, who said: They mentioned him—meaning the Dajjal—in the presence of Ibn Abbas. He said: "It is written between his eyes: K-F-R." He said: Ibn Abbas said: "I did not hear him say that, but he said: 'As for Ibrahim, look at your companion'—Yazid said: meaning the Prophet (peace be upon him)—'and as for Musa, he is a dark-skinned man, with curly hair, tall, as if he is one of the men of Shanu'ah, upon a red camel, bridled with a rope of fiber, and it is as if I am looking at him as he descends from the valley, reciting the Talbiyah.'"