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-Qamar — Ayah 21
فَكَيۡفَ كَانَ عَذَابِي وَنُذُرِ ٢١
So reflect- O people of Makkah - how was my punishment to them? And how was my warning to others about their punishment?