Surah Muhammad, Verse 30

وَلَوۡ نَشَآءُ لَأَرَيۡنَٰكَهُمۡ فَلَعَرَفۡتَهُم بِسِيمَٰهُمۡۚ وَلَتَعۡرِفَنَّهُمۡ فِي لَحۡنِ ٱلۡقَوۡلِۚ وَٱللَّهُ يَعۡلَمُ أَعۡمَٰلَكُمۡ ﴿٣٠﴾

Ve lev neşaü le eraynakehüm fe learaftehüm bisımahüm ve le ta´rifennehüm fı lahnil kavl vallahü ya´lemü a´maleküm

“Had We so wiled, We could have shown them up to thee, and thou shouldst have known them by their marks: but surely thou wilt know them by the tone of their speech! And God knows all that ye do”