In the Christian and Islamic traditions, the Seven Sleepers, otherwise known as the Sleepers of Ephesus and Companions of the Cave, is a medieval legend about a group of youths who hid inside a cave outside the city of Ephesus around AD 250 to escape one of the Roman persecutions of Christians and emerged some 300 years later.
The Companions of the Cave Return With the Qaim
The Commander of the Faithful (as) said: “The Companions of the Cave (Ashab Al-Kahf) will come to assist the Mahdi (as).”
– Husayni, Al-Hidayah, p. 31; Irshad al-Qulub, p. 286; Hilyah al-Abrar, vol. 2, p. 601.