Has the story of the People of the Cave been mentioned in the Torah or the Gospel, and how could it be so when it occurred after Prophet Jesus, peace be upon him, and how is it considered a test for Prophet Muhammad, peace and blessings be upon him, if it is not mentioned in the books of the People of the Book?

The story of the Companions of the Cave is a historical fact, the authenticity of which does not depend on its mention in other books. The Noble Qur'an came as a predominant and additive scripture, and it is not necessary for previous books to include every event. Islamic scholars differed in determining the time of its occurrence. Some believe it was before the era of Christ, based on the Jews' inquiry about it, while others believe it was after him, based on the weakening of some narrations and dating it around 237 CE. The story has been mentioned in many Christian historical sources that confirm its occurrence.