Commentary explaining the meaning of the ayahs. One passage often covers several ayahs, so neighbouring ayahs can show the same text.
English Al-Mukhtasar tafsir for Surah Ash-Shams — Ayah 6
وَٱلۡأَرۡضِ وَمَا طَحَىٰهَا ٦
He also takes an oath on the earth: the way it has been spread so that people can live on it.