You are reading a tafsir for the group of verses 30:25 to 30:26
ومن اياته ان تقوم السماء والارض بامره ثم اذا دعاكم دعوة من الارض اذا انتم تخرجون ٢٥ وله من في السماوات والارض كل له قانتون ٢٦
وَمِنْ ءَايَـٰتِهِۦٓ أَن تَقُومَ ٱلسَّمَآءُ وَٱلْأَرْضُ بِأَمْرِهِۦ ۚ ثُمَّ إِذَا دَعَاكُمْ دَعْوَةًۭ مِّنَ ٱلْأَرْضِ إِذَآ أَنتُمْ تَخْرُجُونَ ٢٥ وَلَهُۥ مَن فِى ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ ۖ كُلٌّۭ لَّهُۥ قَـٰنِتُونَ ٢٦
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3

Sixth sign of divine omnipotence

Existence of the sky and earth is by the command of Allah. When He will command the breakup of this system, this strong arrangement, which is working since thousands of years perfectly without a slight depreciation, will end up in no time. Then by the command of Allah all the dead will assemble in the plain for reckoning.

The sixth sign of divine omnipotence is in fact the sum and substance of the previous five signs, and they were in fact revealed to explain and elaborate this verse. The subject of this verse continues in the next few verses.