Surah An-Naml, Verse 71

وَيَقُولُونَ مَتَىٰ هَٰذَا ٱلۡوَعۡدُ إِن كُنتُمۡ صَٰدِقِينَ٧١

wayaqūlūna matā hādhā l-waʿdu in kuntum ṣādiqīna

And they say, "When is [the fulfillment of] this promise, if you should be truthful?"