Surah Ya-Sin (Ya-Sin), Verse 48

وَیَقُوْلُوْنَ مَتٰی هٰذَا الْوَعْدُ اِنْ كُنْتُمْ صٰدِقِیْنَ ۟

Wa yaqooloona mataa haazal wa'du in kuntum saadiqeen

“Further, they say, "When will this promise (come to pass), if what ye say is true?"”

Quran 36:48 (Yusuf Ali Translation)