ثُمَّ كَلَّا سَيَعْلَمُونَ 
  Thumma kall a  sayaAAlamoon a      And once again:2 Nay, but in time they will come to    understand!
   - Mohammad Asad
 
        
    
    
We repeat, very soon they shall come to know.
   - Muhammad Farooq-i-Azam Malik
   Again, no! They will come to know.
   - Mustafa Khattab
     
Nay, again, but they will come to know!
   - Marmaduke Pickthall
   Verily verily they shall soon (come to) know!
   - Abdullah Yusuf Ali