Sheba 34:29. Juz 22, page 431.
وَيَقُولُونَ مَتَىٰ هَـٰذَا ٱلْوَعْدُ إِن كُنتُمْ صَـٰدِقِينَ٢٩
And they say: When is this promise (to be fulfilled) if ye are truthful?
Saba 34:29, translated by Marmaduke Pickthall