27:71
وَيَقُولُونَ مَتَىٰ هَـٰذَا ٱلْوَعْدُ إِن كُنتُمْ صَـٰدِقِينَ
wayaqūlūna matā hādhā l-waʿdu in kuntum ṣādiqīna
And they say, "When is [the fulfillment of] this promise, if you should be truthful?"
— Saheeh International
They also say, ‘When will this promise be fulfilled if what you say is true?’
— M. A. S. Abdel Haleem
And they (the disbelievers in the Oneness of Allâh) say: "When (will) this promise (be fulfilled), if you are truthful?"
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali