[Dhul-Qarnayn] said, "This is a mercy from my Lord; but when the promise of my Lord comes, He will make it level, and ever is the promise of my Lord true."
The Saheeh International Quran Translation
قَالَ هَٰذَا رَحْمَةٌ مِّن رَّبِّى فَإِذَا جَآءَ وَعْدُ رَبِّى جَعَلَهُۥ دَكَّآءَ وَكَانَ وَعْدُ رَبِّى حَقًّا[Dhul-Qarnayn] said, "This is a mercy from my Lord; but when the promise of my Lord comes, He will make it level, and ever is the promise of my Lord true."