Commentary explaining the meaning of the ayahs. One passage often covers several ayahs, so neighbouring ayahs can show the same text.
Indoniesua Al-Mukhtasar in Interpreting the Noble Quran tafsir for Surah An-Naba — Ayah 21
إِنَّ جَهَنَّمَ كَانَتۡ مِرۡصَادٗا ٢١
Sesungguhnya neraka Jahanam itu senantiasa mengintai dan mengawasi (orang-orang kafir).