لَّوۡلَا جَآءُوۡ عَلَيۡهِ بِاَرۡبَعَةِ شُهَدَآءَۚ فَاِذۡ لَمۡ يَاۡتُوۡا بِالشُّهَدَآءِ فَاُولٰٓٮِٕكَ عِنۡدَ اللّٰهِ هُمُ الۡـكٰذِبُوۡنَ
Why did these (slanderers) not produce four witnesses to this (turmoil)? Since they could not bring forth witnesses, it is certainly they who are liars in the sight of Allah.