18:12

ثُمَّ بَعَثْنَـٰهُمْ لِنَعْلَمَ أَىُّ ٱلْحِزْبَيْنِ أَحْصَىٰ لِمَا لَبِثُوٓا۟ أَمَدًا

thumma baʿathnāhum linaʿlama ayyu l-ḥiz'bayni aḥṣā limā labithū amadan

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.

— Saheeh International

Then We woke them so that We could make clear which of the two parties was better able to work out how long they had been there.

— M. A. S. Abdel Haleem

Then We raised them up (from their sleep), that We might test which of the two parties was best at calculating the time period that they had tarried.

— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali

Word by Word

ثُمَّthummaThen

بَعَثْنَـٰهُمْbaʿathnāhumWe raised them up

لِنَعْلَمَlinaʿlamathat We make evident

أَىُّayyuwhich

ٱلْحِزْبَيْنِl-ḥiz'bayni(of) the two parties

أَحْصَىٰaḥṣābest calculated

لِمَاlimāfor what

لَبِثُوٓا۟labithū(they had) remained

أَمَدًۭاamadan(in) time