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 At-Takathur — Ayah 3
كـَلَّا سَوۡفَ تَعۡلَمُونَ ٣
It is not befitting that boasting with one another over that preoccupies you from the obedience of Allah; you will soon know the consequence of that preoccupation.