Verse 6

وَٱلَّذِينَ يَرْمُونَ أَزْوَٰجَهُمْ وَلَمْ يَكُن لَّهُمْ شُهَدَآءُ إِلَّآ أَنفُسُهُمْ فَشَهَـٰدَةُ أَحَدِهِمْ أَرْبَعُ شَهَـٰدَٰتٍۭ بِٱللَّهِ إِنَّهُۥ لَمِنَ ٱلصَّـٰدِقِينَ

And those who accuse their wives and do not have any witnesses, but themselves, then the testimony of one is equal to four testimonies, invoking God that indeed he is telling the truth.