وَالَّذِينَ يَرْمُونَ أَزْوَاجَهُمْ وَلَمْ يَكُن لَّهُمْ شُهَدَاء إِلَّا أَنفُسُهُمْ فَشَهَادَةُ أَحَدِهِمْ أَرْبَعُ شَهَادَاتٍ بِاللَّهِ إِنَّهُ لَمِنَ الصَّادِقِينَ
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سورة النّور
(24/6) And those who accuse their wives of adultery, if they have no witnesses but themselves, then the testimony of each of them shall be a testimony sworn by Allah four times repeated, that he is indeed of the truthful ones (of those who speak the truth).
Surah An-Nur