The Letter Sad 38:30. Juz 23, page 455.
وَوَهَبْنَا لِدَاوُۥدَ سُلَيْمَـٰنَ ۚ نِعْمَ ٱلْعَبْدُ ۖ إِنَّهُۥٓ أَوَّابٌ٣٠And We bestowed on David, Solomon. How excellent a slave! Lo! he was ever turning in repentance (toward Allah).
Sad 38:30, translated by Marmaduke Pickthall