Al-Kahf 18:12

Thumma baAAathnahum linaAAlama ayyualhizbayni ahsa lima labithoo amada

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.

Thereafter We raised them up, so that We know which of the two groups had better calculated the period in which they remained (sleeping).