ثُمَّ كَلَّا سَيَعْلَمُوْنَ ( النبإ: ٥ )
thumma
ثُمَّ
Then
kallā
كَلَّا
Nay!
sayaʿlamūna
سَيَعْلَمُونَ
soon they will know
Thumma kallaa sa y'alamoon (an-Nabaʾ 78:5)
Sahih International:
Then, no! They are going to know. (An-Naba [78] : 5)
1 Mufti Taqi Usmani
Again, indeed they will soon know.