Abdullah bin Umar reported,

The Messenger of Allah ﷺ stood before the people, praised Allah as He deserves to be praised, then mentioned the Dajjal. He said, "I warn you about him. There has never been a prophet who did not warn his people about him. Nuh warned his people. But I shall tell you something about him that no prophet has told his people. You should know that he is one-eyed, and Allah is not one-eyed."Zuhri said, Umar bin Thabit al-Ansari informed me that one of the companions of the Prophet ﷺ told him that the Prophet ﷺ said to the people that day, while warning them of his trial, "You should know that none of you will see his Lord until he dies, and the letters K F R will be written between his eyes, which every person who detests his deeds will be able to read."

حدثنا عبد بن حميد أخبرنا عبد الرزاق أخبرنا معمر عن الزهري عن سالم

عن ابن عمر قال

قام رسول الله ﷺ في الناس فأثنى على الله بما هو أهله ثم ذكر الدجال فقال إني لأنذركموه وما من نبي إلا وقد أنذر قومه ولقد أنذر نوح قومه ولكني سأقول لكم فيه قولا لم يقله نبي لقومه تعلمون أنه أعور وإن الله ليس بأعور قال الزهري وأخبرني عمر بن ثابت الأنصاري أنه أخبره بعض أصحاب النبي ﷺ أن النبي ﷺ قال يومئذ للناس وهو يحذرهم فتنته تعلمون أنه لن يرى أحد منكم ربه حتى يموت وإنه مكتوب بين عينيه ك ف ر يقرؤه من كره عمله