Ad-Dajjal first appears in pseudoapocalyptic Christian literature and is reworked in Hadith (sayings) ascribed to the Prophet Muhammad. There he is described as a plump, one-eyed man with a ruddy face and curling hair and the Arabic letters k-f-r ("unbelief") on his forehead. Ad-Dajjal will appear during a period of great tribulation; he will be followed by the Jews and will claim to be God in Jerusalem. He will work false miracles, and most people will be deceived. At this moment will occur the Second Coming of Christ.
Tradition expects Ad-Dajjal to appear in the East, possibly Khorasan, or in the West. In the meantime, he is said to be somewhere in the East Indies, on an island from which the sounds of dancing and beautiful music emanate, according to sailors' lore and the tale of Sindbad the Sailor. An alternate version is linked with the Greek Prometheus legend; in this account, Ad-Dajjal is bound to a rock on an island in the sea and is fed by demons.
Qur’an is silent about Ad-Dajjal. Although it mentions about Yajuj-Majuj. Many Islamic scholars think that Yajuj-Majuj is synonymous to Ad-Dajjal. Muhammad described to his followers Ad-Dajjal – where is he going to come from, his demeanor, what would he be asking to Muslims, etc. etc.
In Islamic eschatology, two hostile forces who will ravage the Earth before the end of the world. The Qur'an relates that a certain people terrorized by Yajuj and Majuj induced Alexander the Great to construct a great wall between them. Yajuj and Majuj, thus trapped between two mountains until the last days of the world, dig under the wall every night trying to escape, only to find each morning that the wall has been restored by God (Allah).
Tradition provides several descriptions of Yajuj and
Majuj, who are Muslim counterparts of the biblical Gog and Magog.
Some are tall as cedars, and others wide as they are tall; one variety
is completely covered with ears. They will appear in large numbers
in the northeast of the ancient world as portents of the end, then proceed
south toward Israel, drinking up the waters of the Tigris and Euphrates
rivers or the Sea of Galilee and killing everyone along the way.
When there are no more human targets left for their arrows, Yajuj and Majuj
will shoot at the sky, but God will either fill their ears and noses and
throats with worms and destroy them in a single night or send a flock of
birds to drown them in the sea.
Here is one of the Hadiths on Ad-Dajjal that was found in an Islamic website:
"Ubaidah Bin Saamit (RA) says, Prophet Muhammad (SAWS) said "I have explained Dajjal to you, but I fear that you might not have understood. Dajjal will be short, and his legs will be crooked. The hair on his head will be extremely twisted...... If you have any doubt regarding Dajjal, remember that your Sustainer (ALLAH), is not one eyed. (Because Dajjal will eventually claim to be God himself.His followers shall accept him as such). He will be able to split a person into two and then bring him back life again....(AHMAD). Huzaifah (RA) also says, He will have with him WATER (Heaven) and FIRE (HELL). In reality his hell shall be heaven and his heaven shall be hell......(MUSLIM). In another Hadith of Our Prophet (SAWS) has said, that Dajjal shall not know himself the difference between the two. If you are forced to choose between the two, then choose his fire(Hell), for in reality, it will be cool water, and his water(Heaven), shall be Hell. Imraan Bin Hussain (RA) says the Prophet (SAWS) said."