Commentary explaining the meaning of the ayahs. One passage often covers several ayahs, so neighbouring ayahs can show the same text.
Italian Al-Mukhtasar in interpreting the Noble Quran tafsir for Surah Al-Muzzammil — Ayah 4
أَوۡ زِدۡ عَلَيۡهِ وَرَتِّلِ ٱلۡقُرۡءَانَ تَرۡتِيلًا ٤
Oppure aumenta fino a raggiungere i due terzi; scandisci il Corano mentre lo reciti e fallo adagio.