Sa’d bin Jubair said I asked Ibn ‘Umar A man accused his wife of adultery? He said “The Apostle of Allaah ﷺ separated the brother and the sister of Banu Al ‘Ajilan (i.e., husband and wife). He said Allaah knows that one of you is a liar, will one of you repent? He repeated these words three times, but they refused. So he separated them from each other. (Using translation from Abū Dāʾūd 2258)
قُلْتُ لِابْنِ عُمَرَ رَجُلٌ قَذَفَ امْرَأَتَهُ فَقَالَ فَرَّقَ رَسُولُ اللهِ ﷺ بَيْنَ أَخَوَيْ بَنِي الْعَجْلَانِ وَقَالَ اللهُ يَعْلَمُ أَنَّ أَحَدَكُمَا كَاذِبٌ فَهَلْ مِنْكُمَا تَائِبٌ؟ فَأَبَيَا فَرَدَّدَهُمَا ثَلَاثَ مَرَّاتٍ فَأَبَيَا فَفَرَّقَ بَيْنَهُمَا