Surah Adh-Dhariyat, ayah 23

51:23

فَوَرَبِّ ٱلسَّمَآءِ وَٱلۡأَرۡضِ إِنَّهُۥ لَحَقّٞ مِّثۡلَ مَآ أَنَّكُمۡ تَنطِقُونَ ٢٣

Fawarabbis-samā'i wal-ardi innahū lahaqqum mithla mā annakum tantiqūn

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