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 Adh-Dhariyat — Ayah 17
كَانُواْ قَلِيلٗا مِّنَ ٱلَّيۡلِ مَا يَهۡجَعُونَ ١٧
They used to pray at night, not sleeping except a little.