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
[It is] the promise of Allāh. Allāh does not fail in His promise, but most of the people do not know.
— Saheeh International
This is God’s promise: God never breaks His promise, but most people do not know;
— M. A. S. Abdel Haleem
(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.
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali