"Shall I not tell you of a surah whose greatness fills the space between the heavens and the earth, and for the one who recites it, there is an equal reward, and whoever recites it will have his sins forgiven until the next Friday and for three more days? The companions, may Allah be pleased with them, said: 'Certainly, do tell us.' So he, peace and blessings be upon him, said: Surah Al-Kahf."