The day that We shall seize them with a grievous hold, We will indeed castigate them.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : this is because he said: (on the day when we shall seize them with the greater seizure) we shall punish them with the greater punishment, by the sword on the day of badr ((then), in truth we shall punish) with our torment.
Jalāl al-Dīn al-Maḥallī
تفسير : mention, the day when we shall assault with the most mighty assault — this was the day of [the battle of] badr — [then] indeed we shall take vengeance, on them (al-batsh, means ‘to seize violently’).