ثُمَّ بَعَثْنَـٰهُمْ لِنَعْلَمَ أَىُّ ٱلْحِزْبَيْنِ أَحْصَىٰ لِمَا لَبِثُوٓا۟ أَمَدًا ١٢
Then We awakened them that We might show which of the two factions was most precise in calculating what [extent] they had remained in time.
Your location stays on this device and is only sent, rounded to about 1 km, to fetch the times.