Dr. Mustafa Khattab, the Clear Quran - Surah At-Takathur, ayah 4

Translation of Surah At-Takathur, ayah 4 (102:4)

ثُمَّ كـَلَّا سَوۡفَ تَعۡلَمُونَ ٤
Again, no! You will soon come to know.