18:12
ثُمَّ بَعَثْنَٰهُمْ لِنَعْلَمَ أَىُّ ٱلْحِزْبَيْنِ أَحْصَىٰ لِمَا لَبِثُوٓا۟ أَمَدًۭا
Summa ba'asnaahum lina'lama ayyul hizbaini ahsaa limaa labisooo amadaa
and then roused them so that We might see which of the two parties could best tell the length of their stay.