al-Saʿdī
Al-Saʿdī explains that the cause of the disbelievers' punishment is laid bare here: they did not hope for or fear a Day of Reckoning, so they neither prepared for it nor worked for it, and they brazenly rejected the signs and proofs God sent. Against this heedlessness God affirms that He has counted and written down every single thing, however small, in a precise record — so nothing of their deeds escapes accounting. Therefore on that Day they are told, 'Taste,' and the only thing that will ever be added to them is more torment, for there is no relief or reduction once recompense has begun.