Аль-Кахф 18:27

Yet another question arises here about the People of Kahf. During their time and then within the blessed period of the Holy Prophet ﷺ ، the Jews and Christians had their differences about two things - the number of the People of Kahf and the duration of their sleep in the Cave. The Qur'an does describe both. However, it has done so with a difference. The number was not mentioned explicitly. Rather, only a hint has been given by not refuting the view which was correct. But, the fixed duration was declared in very clear words: وَلَبِثُوا فِي كَهْفِهِمْ ثَلَاثَ مِائَةٍ سِنِينَ وَازْدَادُوا تِسْعًا (And they stayed in their Cave for three hundred years and added nine -25). The reason is that this very remarkable diction of the Qur'an strongly suggests that this debate on the number of the people of Kahf is virtually useless. No worldly or religious issue relates to or depends on it. Yes, this unusual sleep for such a long period of time, being healthy and fit without food and drink and then sitting up in good shape after such a long time is certainly a working model of Resurrection. That there is a Day of Judgment and that there is a Hereafter can be argued on this basis. Therefore, the period of sleep was stated very clearly.

People who deny the extraordinary miracles, or people who are in the habit of explaining them away overawed by the objections of modern day Jewish and Christian orientalists, have not spared even the Qur'an. For example, in the case of this verse (25), they have tried to use the explanation of Qatadah as a prop to reject the duration of three hundred nine years as the saying of those very people who were differing among them-selves. But, they have erred. The statement: (for a number of years - 11) which appears in an earlier sentence of the Qur'an cannot be called the saying of anyone other than Allah Ta’ ala! To prove the miraculous nature of the event even this much is sufficient that someone remains asleep for years and years and then rises and sits up all intact, fit and alive. Allah knows best.