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 Al-Fajr — Ayah 21
كـَلَّآۖ إِذَا دُكَّتِ ٱلۡأَرۡضُ دَكّٗا دَكّٗا ٢١
These actions are not befitting of you. Remember when the earth will be moved vigorously and shaken.