Abdullah bin Umar reported,

We were speaking about the Farewell Pilgrimage while the Prophet ﷺ was among us, though we did not know what the Farewell Pilgrimage was. He praised Allah and extolled Him, then mentioned the Messiah Dajjal and spoke about him at length. He said, "Allah has not sent any prophet without his having warned his people about him. Nuh warned his people, and the prophets after him warned theirs. He will appear among you, and whatever may be hidden from you about his nature, this much will not be hidden from you, that your Lord is not as he will appear to be." He said this three times."Your Lord is not one-eyed, but he is blind in his right eye, his eye like a floating grape. Indeed, Allah has made your blood and your wealth as sacred to you as this day of yours, in this land of yours, in this month of yours. Have I conveyed the message?"They said, "Yes."He said, "Allah, bear witness," three times. "Woe to you! Take heed, do not return to disbelief after me, striking the necks of one another."

عن ابن عمر، قال

كنا نتحدث بحجة الوداع، والنبي ﷺ بين أظهرنا، ولا ندري ما حجة الوداع، فحمد الله وأثنى عليه، ثم ذكر المسيح الدجال فأطنب في ذكره، وقال: ما بعث الله من نبي إلا أنذر أمته، أنذره نوح والنبيون من بعده، وإنه يخرج فيكم، فما خفي عليكم من شأنه فليس يخفى عليكم: أن ربكم ليس على ما يخفى عليكم. ثلاثا- إن ربكم ليس بأعور، وإنه أعور عين اليمنى، كأن عينه عنبة طافية. ألا إن الله حرم عليكم دماءكم وأموالكم، كحرمة يومكم هذا، في بلدكم هذا، في شهركم هذا، ألا هل بلغت؟ قالوا: نعم، قال: اللهم اشهد ثلاثا. ويلكم، أو ويحكم! انظروا، لا ترجعوا بعدي كفارا، يضرب بعضكم رقاب بعض.