This is so that God may try the faithful and destroy the unbelievers.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (and that allah may prove) may forgive (those who believe) for that which befalls them in jihad, (and may blight the disbelievers) and may destroy the unbelievers in war.
Jalāl al-Dīn al-Maḥallī
تفسير : and that god may prove the believers, purifying them of sins through what befalls them, and efface, that is, destroy, the disbelievers.
Sahl al-Tustari
تفسير : and that god may prove the believers…this means their being purified (takhlīṣ) from the blemishes of sins, just as they devoted themselves purely to him (akhlaṣū lahu) in deed, which was [their] striving (jihād) in the way of god; …and efface the disbelievers. this means the destruction of the disbelievers through the affliction brought on by their sins.his words: