A. Yusuf Ali:Translation:
Why did they not bring four witnesses to prove
it? 2966 When they have not brought the witnesses,
such men, in the sight of Allah, (stand forth)
themselves as liars!

Muhammad Asad:Translation:
why do they not [demand of the accusers that they] 16 their allegation? 17 for, if they do not produce such witnesses, it is those [accusers] who, in the sight of God, are liars indeed!
2966 If any persons took it seriously, it was their duty to search for and produce the evidence, in the absence of which they themselves became guilty of slander.