Sura 78 An-Naba' (The Announcement), aya 4 – 5

1. كَلَّا سَيَعْلَمُونَ

   No! They are going to know.

   78:4

2. ثُمَّ كَلَّا سَيَعْلَمُونَ

   Then, no! They are going to know.

   78:5

Tafsiri: Saheeh International