Quran 55:60 from Surah Ar-Rahmaan on Divine Marvels.
هَلۡ جَزَآءُ ٱلۡإِحۡسَٰنِ إِلَّا ٱلۡإِحۡسَٰنُ
English translation: Is (the) reward for the good but good
Transliteration: hal jazau al-ih'sani illa al-ih'sanu