Al Anbiya, 38 Ayah
21:38
وَيَقُولُونَ مَتَىٰ هَٰذَا ٱلۡوَعۡدُ إِن كُنتُمۡ صَٰدِقِينَ ٣٨
Wa Yaqūlūna Matá Hādhā Al-Wa`du 'In Kuntum Şādiqīna
And they say, "When is this promise, if you should be truthful?"