Surah An-Nur, Verse 4

وَٱلَّذِينَ يَرۡمُونَ ٱلۡمُحۡصَنَٰتِ ثُمَّ لَمۡ يَأۡتُواْ بِأَرۡبَعَةِ شُهَدَآءَ فَٱجۡلِدُوهُمۡ ثَمَٰنِينَ جَلۡدَةٗ وَلَا تَقۡبَلُواْ لَهُمۡ شَهَٰدَةً أَبَدٗاۚ وَأُوْلَٰٓئِكَ هُمُ ٱلۡفَٰسِقُونَ٤

wa-alladhīna yarmūna l-muḥ'ṣanāti thumma lam yatū bi-arbaʿati shuhadāa fa-ij'lidūhum thamānīna jaldatan walā taqbalū lahum shahādatan abadan wa-ulāika humu l-fāsiqūna

And those who accuse chaste women and then do not produce four witnesses - lash them with eighty lashes and do not accept from them testimony ever after. And those are the defiantly disobedient,