قَالُوا۟ فَمَا جَزَٰٓؤُهُۥٓ إِن كُنتُمْ كَـٰذِبِينَ 
  Q a loo fam a  jaz a ohu in kuntum k ath ibeen a      [The Egyptians] said: "But what shall be the requital of this    [deed] if you are [proved to be] liars?"
   - Mohammad Asad
     
The royal servants said: "What should be the punishment of the    thief, if you are liars?"
   - Muhammad Farooq-i-Azam Malik
   Joseph's men asked, 'What should be the price for theft, if you are lying?'
   - Mustafa Khattab
     
They said : And what shall be the penalty for it if ye prove    liars?
   - Marmaduke Pickthall
   (The Egyptians) said: "What then shall be the penalty of this if    ye are (proved) to have lied?" 1739
   - Abdullah Yusuf Ali