We were talking about the Farewell Pilgrimage without knowing what was it when Messenger of Allah (ﷺ) was also present. He (ﷺ) stood up and recited the Praise and Glorification of Allah. He then gave a detailed account of Ad-Dajjal and said, 'Every Prophet sent by Allah had warned his people against his mischief. Nuh (ﷺ) )warned his nation and so did all the Prophets after him. If he (i.e., Ad-Dajjal) appears among you, his condition will not remain hidden from you. Your Rubb is not one-eyed, but Ad-Dajjal is. His right eye is protruding like a swollen grape. Listen, Allah has made your blood, and your properties as inviolable as of this day of yours (i.e., the Day of Sacrifice), in this city of yours (i.e., Makkah), in this month of yours (i.e., Dhul -Hijjah). Listen, have I conveyed Allah's Message to you?'' The people replied in affirmative. There upon he said, "O Allah, bear witness.'' And he repeated it thrice. He (ﷺ) concluded: "Do not revert after me as infidels killing one another".

[Al-Bukhari].