Quran 17:25 from Surah Al-Israa on Divine Marvels.
رَّبُّكُمۡ أَعۡلَمُ بِمَا فِي نُفُوسِكُمۡۚ إِن تَكُونُواْ صَٰلِحِينَ فَإِنَّهُۥ كَانَ لِلۡأَوَّٰبِينَ غَفُورٗا
English translation: Your Lord (is) most knowing of what (is) in yourselves If you are righteous then indeed He is to those who often turn (to Him) Most Forgiving
Transliteration: rabbukum a'lamu bima fi nufusikum in takunu salihina fa-innahu kana lil'awwabina ghafuran