لَّوْلَا جَآءُو عَلَيْهِ بِأَرْبَعَةِ شُهَدَآءَ ۚ فَإِذْ لَمْ يَأْتُوا بِٱلشُّهَدَآءِ فَأُولَـٰٓئِكَ عِندَ ٱللَّهِ هُمُ ٱلْكَـٰذِبُونَ

Lawla jaoo AAalayhibi-arbaAAati shuhadaa fa-ith lam ya/too bishshuhada-ifaola-ika AAinda Allahi humu alkathiboon

Why did they [who slandered] not produce for it four witnesses? And when they do not produce the witnesses, then it is they, in the sight of Allāh, who are the liars.