Al Kahf Ayah 12

ثُمَّ بَعَثْنَـٰهُمْ لِنَعْلَمَ أَىُّ ٱلْحِزْبَيْنِ أَحْصَىٰ لِمَا لَبِثُوٓاْ أَمَدًا ١٢ then We raised them so We may show which of the two groups would make a better estimation of the length of their stay.