Surah An-Najm (The Stars), Verse 30

ذٰلِكَ مَبْلَغُهُمْ مِّنَ الْعِلْمِ اِنَّ رَبَّكَ هُوَ اَعْلَمُ بِمَنْ ضَلَّ عَنْ سَبِیْلِهٖ وَهُوَ اَعْلَمُ بِمَنِ اهْتَدٰی ۟

Zalika mablaghuhum minal 'ilm; inna rabbaka huwa a'lamu biman dalla 'an sabee lihee wa huwa a'lamu bimanih tadaa

“That is as far as knowledge will reach them. Verily thy Lord knoweth best those who stray from His Path, and He knoweth best those who receive guidance.”

Quran 53:30 (Yusuf Ali Translation)