From Sahih Bukhari (Hadith 7127):
Narrated `Abdullah bin `Umar:Allah's Messenger (ﷺ) stood up amongst the people and then praised and glorified Allah as He deserved and then he mentioned Ad-Dajjal, saying, "I warn you of him, and there was no prophet but warned his followers of him; but I will tell you something about him which no prophet has told his followers: Ad- Dajjal is one-eyed whereas Allah is not
Reference: Bukhari 7127