Quran 24:6 from Surah An-Noor on Divine Marvels.
وَٱلَّذِينَ يَرۡمُونَ أَزۡوَٰجَهُمۡ وَلَمۡ يَكُن لَّهُمۡ شُهَدَآءُ إِلَّآ أَنفُسُهُمۡ فَشَهَٰدَةُ أَحَدِهِمۡ أَرۡبَعُ شَهَٰدَٰتِۭ بِٱللَّهِ إِنَّهُۥ لَمِنَ ٱلصَّٰدِقِينَ
English translation: And those who accuse their spouses and not have for them witnesses except themselves then (the) testimony (of) one of them (is) four testimonies by Allah that he (is) surely of the truthful
Transliteration: wa-alladhina yarmuna azwajahum walam yakun lahum shuhadau illa anfusuhum fashahadatu ahadihim arba'u shahadatin bil-lahi innahu lamina al-sadiqina