Surah Adh-Dhariyat Verse 23

فَوَرَبِّ السَّمَاءِ وَالْأَرْضِ إِنَّهُ لَحَقٌّ مِثْلَ مَا أَنَّكُمْ تَنْطِقُونَ

Then by the Lord of the heaven and earth, indeed, it is truth - just as [sure as] it is that you are speaking