78:4

كَلَّا سَيَعْلَمُونَ

Transliteration:

Kalla sayaAAlamoona

Word by Word:

Nay! (soon) they will know.

Translations:

Nay, but in time they will come to understand [it]!

Verily, they shall soon (come to) know!

Nay, but they will come to know!

Nay, they will soon know;

No! They are going to know.