The Prophets
وَجَعَلْنَا فِى ٱلْأَرْضِ رَوَٰسِىَ أَن تَمِيدَ بِهِمْ وَجَعَلْنَا فِيهَا فِجَاجًا سُبُلًا لَّعَلَّهُمْ يَهْتَدُونَ
And We placed within the earth firmly set mountains, lest it should shift with them, and We made therein [mountain] passes [as] roads that they might be guided.
Nearby ayahs help place verse 21:31 in sequence and meaning.
۞ وَمَن يَقُلْ مِنْهُمْ إِنِّىٓ إِلَـٰهٌ مِّن دُونِهِۦ فَذَٰلِكَ نَجْزِيهِ جَهَنَّمَ ۚ كَذَٰلِكَ نَجْزِى ٱلظَّـٰلِمِينَ
And whoever of them should say, "Indeed, I am a god besides Him"- that one We would recompense with Hell. Thus do We recompense the wrongdoers.
أَوَلَمْ يَرَ ٱلَّذِينَ كَفَرُوٓا۟ أَنَّ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضَ كَانَتَا رَتْقًا فَفَتَقْنَـٰهُمَا ۖ وَجَعَلْنَا مِنَ ٱلْمَآءِ كُلَّ شَىْءٍ حَىٍّ ۖ أَفَلَا يُؤْمِنُونَ
Have those who disbelieved not considered that the heavens and the earth were a joined entity, and We separated them and made from water every living thing? Then will they not believe?
وَجَعَلْنَا ٱلسَّمَآءَ سَقْفًا مَّحْفُوظًا ۖ وَهُمْ عَنْ ءَايَـٰتِهَا مُعْرِضُونَ
And We made the sky a protected ceiling, but they, from its signs, are turning away.
وَهُوَ ٱلَّذِى خَلَقَ ٱلَّيْلَ وَٱلنَّهَارَ وَٱلشَّمْسَ وَٱلْقَمَرَ ۖ كُلٌّ فِى فَلَكٍ يَسْبَحُونَ
And it is He who created the night and the day and the sun and the moon; all [heavenly bodies] in an orbit are swimming.