Quran 41:8 from Surah Fussilat on Divine Marvels.
إِنَّ ٱلَّذِينَ ءَامَنُواْ وَعَمِلُواْ ٱلصَّٰلِحَٰتِ لَهُمۡ أَجۡرٌ غَيۡرُ مَمۡنُونٖ
English translation: Indeed those who believe and do righteous deeds for them (is) a reward never ending never ending
Transliteration: inna alladhina amanu wa'amilu al-salihati lahum ajrun ghayru mamnunin