Surah An-Noor, Verse 4
وَٱلَّذِينَ يَرْمُونَ ٱلْمُحْصَنَٰتِ ثُمَّ لَمْ يَأْتُوا۟ بِأَرْبَعَةِ شُهَدَآءَ فَٱجْلِدُوهُمْ ثَمَٰنِينَ جَلْدَةًۭ وَلَا تَقْبَلُوا۟ لَهُمْ شَهَٰدَةً أَبَدًۭا ۚ وَأُو۟لَٰٓئِكَ هُمُ ٱلْفَٰسِقُونَ
Translation — Sahih International
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,
Source
Kur'an-ı Kerim, Nûr Suresi 24:4
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/24-suresi-4-ayet