Fain tawallaw fainna Allaha AAaleemun bialmufsideena
English
Ahmed Ali
If they turn away (remember) God knows the mischief-mongers.
63
Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (and if they turn away) from joining the prophet (pbuh) in invoking allah's curse on those who lie about him regarding jesus (then lo! allah is aware of (who are) the corrupters) i.e. the christians of najran.
Jalāl al-Dīn al-Maḥallī
تفسير : 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’]).