ذَٰلِكَ مَبْلَغُهُم مِّنَ ٱلْعِلْمِ ۚ إِنَّ رَبَّكَ هُوَ أَعْلَمُ بِمَن ضَلَّ عَن سَبِيلِهِۦ وَهُوَ أَعْلَمُ بِمَنِ ٱهْتَدَىٰ
Zalika mablaghuhum minal 'ilm; inna rabbaka huwa a'lamu biman dalla 'an sabee lihee wa huwa a'lamu bimanih tadaa
Their knowledge does not go beyond that. Your Lord knows best who strays from His path and who follows guidance.
That is the limit of their knowledge. Indeed, your Lord knows best who has strayed from his path, and he knows best who is guided.