6وَعدَ اللَّهِ ۖ لا يُخلِفُ اللَّهُ وَعدَهُ وَلٰكِنَّ أَكثَرَ النّاسِ لا يَعلَمونَHilali & Khan(It is) a Promise of Allah (i.e. Allah will give victory to the Romans against the Persians), and Allah fails not in His Promise, but most of men know not.