Saf ibn Sayyad
Saf ibn Sayyad (Arabic: الصف بن الصياد), later known as Abdullah ibn Sa’id (Arabic: عبد الله بن سعيد), was an alleged claimant of prophethood during the time of Islamic prophet Muhammad and his companions who later disappeared after the Ridda wars. Umar, a senior companion of Muhammad, and even some Islamic scholars today, speculate that he might be the Dajjal, who, according to Islamic beliefs, is the false Messiah and a major sign of the end of the world.
