Do they not see how God originates creation, then reverts it back? This is indeed how inevitably the law of God works;
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (see they not) have the disbelievers of mecca not been informed in the book (how allah produceth creation) from a sperm drop, (then reproduceth it) on the day of judgement? (lo! for allah that is easy) its production and reproduction is easy.
Jalāl al-Dīn al-Maḥallī
تفسير : have they not seen (yaraw, or taraw, ‘have you not seen?’), observed, how god originates creation (yubdi’u, from [4th form] abda’a; a variant reading has yabda‘u from [1st form] bada’a, both with the same meaning: ‘he creates them originally’) then, he, restores it, namely, creation, just as he originated them? surely that, which is mentioned of the first and the second [acts of] creation, is easy for god, so how can they deny the second one?