لَوْلَا جَاؤُوا عَلَيْهِ بِأَرْبَعَةِ شُهَدَاء فَإِذْ لَمْ يَأْتُوا بِالشُّهَدَاء فَأُوْلَئِكَ عِندَ اللَّهِ هُمُ الْكَاذِبُونَ
[24:13]
Why did they not bring four witnesses of it? But as they have not brought witnesses they are liars before Allah.
Why did they not bring four witnesses to prove it? When they have not brought the witnesses, such men, in the sight of Allah, (stand forth) themselves as liars!
Why did they not produce four witnesses? Since they produce not witnesses, they verily are liars in the sight of Allah.