(And (remember) the Day that the enemies of Allah will be gathered to the Fire, then they will be driven.) means, remind these idolators of the Day when they will be gathered to the Fire and they will be driven, i.e., the keepers of Hell will gather the first of them with the last of them, as Allah says elsewhere:
وَنَسُوقُ الْمُجْرِمِينَ إِلَى جَهَنَّمَ وِرْداً
(And We shall drive the criminals to Hell, in a thirsty state) (19:86). n
حَتَّى إِذَا مَا جَآءُوهَا
(Till, when they reach it,) means, when they stand at its edge,
وَمَا كُنتُمْ تَسْتَتِرُونَ أَن يَشْهَدَ عَلَيْكُمْ سَمْعُكُمْ (And you had not been hiding your selves [ when committing sins ] because of [ the apprehension ] that your ears and your eyes and your skins would bear witness against you,….41:22) This verse means that if anyone wants to commit a sin or a crime, he may hide it from others, but how can he hide it from his own limbs and organs? When it is known that our ears, eyes, hands, feet, skin and hair are not ours, rather they are witnesses of the state against us, and when they would be questioned about our deeds, they would give true evidence, then there is no way to hide the commitment of a crime or a sin. The only way to avoid the disgrace is to keep away from sin. Although it is not expected from the deniers of Oneness of Allah and of prophethood, that it would enter their minds that their organs and limbs would speak up before Allah Almighty and give evidence against themselves, yet any intelligent person could have understood that it is totally impossible that the One who has created him from a lowly matter, given him ability to hear and see, brought him up and made him young, will not fully know his deeds and state of affairs. But you had thought, against this evident matter, that Allah Almighty had no knowledge of many of your deeds. This false assumption encouraged you to commit ` shirk' and ` kufr'. This is the meaning of Verse 23 where it is said, ' وَذَٰلِكُمْ ظَنُّكُمُ الَّذِي ظَنَنتُم بِرَبِّكُمْ أَرْدَاكُمْ "And this thought of yours that you conceived about your Lord brought you to ruin..."
Man is living in a world where the vastness of heaven and earth negates the greatness of man; where the event of death proves that man is a non-entity and truly powerless. In spite of this, man poses as being great and harbours no doubts of his power. God, time and again, causes the Truth to be revealed and declared, thus disproving man’s claim to greatness. But man does not learn a lesson until he is destroyed. The ruins of the ‘Ad, Thamud and other communities are concrete examples of the results of human folly. The very days that these peoples considered auspicious became the very reverse at the behest of the Almighty. Here ‘inauspicious days’ means winter, for the Arabs called winter inauspicious.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.