Musnad Ahmad 27:1610

Yunus narrated to us, Hammad—meaning Ibn Salamah—narrated to us, from Ayyub and Ubaydullah, from Nafi’, from Abdullah ibn Umar, that the Messenger of Allah (ﷺ) said: "Indeed, the Dajjal is blind in his right eye, and his other eye is as if it were a floating grape."