Tafseer of The Announcement · An-Naba · 78:5
Then, no! They are going to know.
Important: The Arabic source text is always authoritative. This translation is a study aid and has not been verified by scholars — do not use it as a basis for religious proof or for deriving rulings (ahkam). When in doubt, always consult the Arabic text and a qualified scholar.
( ثُمَّ كَلا سَيَعْلَمُونَ ) — "Again, no, they will come to know" — this refers to the believers, and thus he used to recite it as well.