Surah Saba' (The Sheba), Verse 29

وَیَقُوْلُوْنَ مَتٰی هٰذَا الْوَعْدُ اِنْ كُنْتُمْ صٰدِقِیْنَ ۟

Wa yaqooloona mataa haazal wa'du in kuntum saadiqeen

“They say: "When will this promise (come to pass) if ye are telling the truth?"”

Quran 34:29 (Yusuf Ali Translation)