﴿ فَإِن تَوَلَّوْا۟ فَإِنَّ ٱللَّهَ عَلِيمٌۢ بِٱلْمُفْسِدِينَ ﴾

“And if they turn away [from this truth] - behold, God has full knowledge of the spreaders of corruption.”

And if they turn their backs rejecting faith assuredly God knows the agents of corruption and will requite them here the third person pronominalisation has been replaced with the overt noun al-mufsidūn ‘the agents of corruption’.