لَّوۡلَا جَآءُو عَلَيۡهِ بِأَرۡبَعَةِ شُهَدَآءَۚ فَإِذۡ لَمۡ يَأۡتُواْ بِٱلشُّهَدَآءِ فَأُوْلَٰٓئِكَ عِندَ ٱللَّهِ هُمُ ٱلۡكَٰذِبُونَ ١٣
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.
Translation: Saheeh International (English)
Each word's meaning and sound
Why did those who accuse the Mother of the Believers Aishah (may Allah be pleased with her) not bring four witnesses upon their grave accusation, to testify to the authenticity of what they attributed to her? But if they do not bring four witnesses on that, and they will never be able to bring them, they are liars in the order of Allah.
Al-Mukhtasar in interpreting the Noble Quran