Ya-Sin 36:48

وَيَقُولُونَ مَتَىٰ هَـٰذَا ٱلْوَعْدُ إِن كُنتُمْ صَـٰدِقِينَ

Wayaqūlūna matā hādhā l-waʿdu in kuntum ṣādiqīna

And they say, "When is this promise, if you should be truthful?"