No! You are going to know.
كَلَّا سَوْفَ تَعْلَمُونَ
Then no! You are going to know.
ثُمَّ كَلَّا سَوْفَ تَعْلَمُونَ
No! They are going to know.
كَلَّا سَيَعْلَمُونَ