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 Az-Zalzalah — Ayah 1
إِذَا زُلۡزِلَتِ ٱلۡأَرۡضُ زِلۡزَالَهَا ١
When the earth will be shaken vigorously, which will happen to it on the Day of Judgement.