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-Layl — Ayah 15
لَا يَصۡلَىٰهَآ إِلَّا ٱلۡأَشۡقَى ١٥
None will suffer the heat of this fire except the most wretched, i.e. the disbeliever.