Surah Yunus (Jonah), Verse 53

وَیَسْتَنْۢبِـُٔوْنَكَ اَحَقٌّ هُوَ قُلْ اِیْ وَرَبِّیْۤ اِنَّهٗ لَحَقٌّ وَمَاۤ اَنْتُمْ بِمُعْجِزِیْنَ 

Wa yastanbi'oonaka 'a haqqun huwa qul ee wa Rabbeee innahoo lahaqq; wa maaa antum bimu'jizeen

“They seek to be informed by thee: "Is that true?" Say: "Aye! by my Lord! it is the very truth! and ye cannot frustrate it!"”

Quran 10:53 (Yusuf Ali Translation)