Surah Al-Kahf, revealed during the third stage of the Prophet Muhammad's prophethood, addresses the challenges faced by Muslims due to persecution and provides comforting narratives about the 'sleepers of the cave,' Khidr, and Zul-Qarnain. These stories emphasize the power of faith and the importance of trusting in Allah amidst trials, serving both as a response to the disbelievers' challenges and as a source of encouragement for believers. The surah ultimately reiterates the truths of monotheism and the afterlife, urging people to mend their ways for their own good.