Musnad Ahmad 1304:20

Hashim narrated to us, he said: Abd al-Hamid narrated to us, he said: Shahr narrated to us, he said: And Asma bint Yazid narrated to me, that the Messenger of Allah, peace and blessings of Allah be upon him, sat in a gathering one time speaking to them about the one-eyed Dajjal, and he mentioned the like of it, and he added in it, so he said: "Muhaymin." And it was a word from the Messenger of Allah, peace and blessings of Allah be upon him, when he would ask about something, he would say: "Muhaymin." And he added in it: "So whoever is present at my gathering and hears my speech, let the witness among you convey it to the absent. And know that Allah, the Mighty and Majestic, is sound, not one-eyed. And that the Dajjal is one-eyed, with a wiped eye, between his eyes is written 'Kafir' (disbeliever), which every believer will read, whether he is literate or illiterate."