Surah Ar-Rum, Verse 6

وَعۡدَ ٱللَّهِۖ لَا يُخۡلِفُ ٱللَّهُ وَعۡدَهُۥ وَلَٰكِنَّ أَكۡثَرَ ٱلنَّاسِ لَا يَعۡلَمُونَ٦

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.