This is the extent of their knowledge. Your Lord is fully aware of those who strayed away from His path, and He is fully aware of those who are guided.
ذٰلِكَ مَبلَغُهُم مِنَ العِلمِ إِنَّ رَبَّكَ هُوَ أَعلَمُ بِمَن ضَلَّ عَن سَبيلِهِ وَهُوَ أَعلَمُ بِمَنِ اهتَدىٰ
zalika mablaghuhum minal ‘ilm; inna rabbaka huwa a’lamu biman dalla ‘an sabee lihee wa huwa a’lamu bimanih tadaa