Surah Al-Isra' (The Night Journey), Verse 9

اِنَّ هٰذَا الْقُرْاٰنَ یَهْدِیْ لِلَّتِیْ هِیَ اَقْوَمُ وَیُبَشِّرُ الْمُؤْمِنِیْنَ الَّذِیْنَ یَعْمَلُوْنَ الصّٰلِحٰتِ اَنَّ لَهُمْ اَجْرًا كَبِیْرًا ۟

Inna haazal Quraana yahdee lillatee hiya aqwamu wa yubashshirul mu'mineenal lazeena ya'maloonas saalihaati anna lahum ajran kabeeraa

“Verily this Qur'an doth guide to that which is most right (or stable), and giveth the Glad Tidings to the Believers who work deeds of righteousness, that they shall have a magnificent reward;”

Quran 17:9 (Yusuf Ali Translation)