And they say, "When is [the fulfillment of] this promise, if you should be truthful?"
The Saheeh International Quran Translation
وَيَقُولُونَ مَتَىٰ هَٰذَا ٱلْوَعْدُ إِن كُنتُمْ صَٰدِقِينَAnd they say, "When is [the fulfillment of] this promise, if you should be truthful?"