30:6
وَعْدَ ٱللَّهِ ۖ لَا يُخْلِفُ ٱللَّهُ وَعْدَهُۥ وَلَـٰكِنَّ أَكْثَرَ ٱلنَّاسِ لَا يَعْلَمُونَ
waʿda l-lahi lā yukh'lifu l-lahu waʿdahu walākinna akthara l-nāsi lā yaʿlamūna
This is God’s promise: God never breaks His promise, but most people do not know;
(It is) a Promise of Allâh (i.e. Allâh will give victory to the Romans against the Persians), and Allâh fails not in His Promise, but most of men know not.