Their awakening and sending One of Themselves to buy Food Allah says: `just as We caused them to ...

كَمْ لَبِثْتُمْ

(How long have you stayed (here)) meaning, `how long have you slept'

Commentary

The word: کَذٰلِک (kadhalik) in the first sentence is for comparison. The purpose at this place is to describe the mutual likeness of two events. One of these is the event of the long sleep of the People of Kahf for an equally long period of time mentioned in the beginning of the story under the verse: فَضَرَ‌بْنَا عَلَىٰ آذَانِهِمْ فِي الْكَهْفِ سِنِينَ عَدَدًا : "So, We veiled their hearing (putting them to sleep) in the Cave for a number of years - 11." The second event relates to the rising of these people from that long drawn sleep - intact, healthy and fit despite the absence of any energy-giving intake - and becoming wide awake. Both are alike in being signs of the power of Allah Ta` ala. For this reason, when 'raising them up' was mentioned in this verse, the word: کَذٰلِک (kadhalik: 'And similarly' ) was used to indicate that the way their sleep was not like the habitual sleep of common people, very similarly, their rising too was distinct from natural habit. Then, as for the next statement after that: لِيَتَسَاءَلُوا ، meaning 'so that they ask each other [ as to how long the sleep was ],' it is not the reason of 'raising them up.' Instead, it is a mention of a usual phenomenon. Therefore, the particle: لام (lam) in: لِيَتَسَاءَلُوا (liyatasa'alu: so that they ask) has been identified as the lam of ` aqibah (consequence) or sairurah (result) meaning that which naturally follows as a sequel. (Abu Hayyan, al-Qurtubi)