﴿ قَالَ رَبِّ إِنِّى ظَلَمْتُ نَفْسِى فَٱغْفِرْ لِى فَغَفَرَ لَهُۥٓ ۚ إِنَّهُۥ هُوَ ٱلْغَفُورُ ٱلرَّحِيمُ ﴾

“[And] he prayed: O my Sustainer! Verily, I have sinned against myself! Grant me, then, Thy forgiveness!” And He forgave him - for, verily, He alone is truly forgiving, a dispenser of grace.”

Please check ayah 28:17 for complete tafsir.