12ثُمَّ بَعَثناهُم لِنَعلَمَ أَيُّ الحِزبَينِ أَحصىٰ لِما لَبِثوا أَمَدًا(Irfan-ul-Quran)Then We raised them up to see which of the two groups would most rightly calculate (the time) that they stayed (in the cave).