27:71

An-Naml 27:71

وَيَقُولُونَ مَتَىٰ هَٰذَا ٱلْوَعْدُ إِن كُنتُمْ صَٰدِقِينَ

Wa yaqooloona mataa haazal wa'du in kuntum saadiqeen

They also say: "When will this promise (come to pass)? (Say) if ye are truthful."