Reference: Fataawa al-Lajnah ad-Daa.imah lil-Buhooth al-‘Ilmiyyah wal-Iftaa. – Volume 3, Page 146, Question No.2 of Fatwa No.3381
Question: Is the appearance of the Dajjaal as mentioned in the prophetic ahaadeeth, and what is the level of authenticity of these ahaadeeth?
Response: The authentic mutawaatir (that which is narrated by such a large number of people that it is impossible that they have invented a lie) ahaadeeth mention the appearance of the Dajjaal, and his appearance is from the signs of the [Last] Hour. So refer to the books of hadeeth reagrding this, [such as] Saheeh al-Bukhaaree and Saheeh Muslim, and «Jaami’ al-Usool» and other than them from the established books of hadeeth.
And with Allaah lies all success and may Allaah send prayers and salutations upon our Prophet (sal-Allaahu ‘alayhi wa sallam) and his family and his companions.