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-Mutaffifin — Ayah 18
كـَلَّآ إِنَّ كِتَٰبَ ٱلۡأَبۡرَارِ لَفِي عِلِّيِّينَ ١٨
The matter is not as you thought - that there will be no reckoning or recompense. The book of the people of obedience will be in Illiyyun.