Musnad Ahmad 32:1441

Yunus narrated to us, Hammad—meaning Ibn Salamah—narrated to us, from Humayd and Shu'ayb ibn al-Habhab, from Anas ibn Malik, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The Dajjal is one-eyed, and your Lord is not one-eyed. Written between his eyes is 'Kafir' (disbeliever), which every believer will read, whether literate or illiterate."