Oneness, Uniqueness of Allah (Tawheed)

Bukhari :: Book 9 :: Volume 93 :: Hadith 504

Narrated 'Abdullah:

Ad-Dajjal was mentioned in the presence of the Prophet. The Prophet said, "Allah is not hidden from you; He is not one-eyed," and pointed with his hand towards his eye, adding, "While Al-Masih Ad-Dajjal is blind in the right eye and his eye looks like a protruding grape."