Sahih al-Bukhari 68:56
Narrated Ibn `Abbas:
Hilal bin Umaiyya accused his wife of illegal sexual intercourse and came to the Prophet (ﷺ) to bear witness (against her), (taking the oath of Lian). The Prophet (ﷺ) was saying, "Allah knows that either of you is a liar. Will anyone of you repent (to Allah)?" Then the lady got up and gave her witness.
Reference
Sahih al-Bukhari 68:56
In-book reference
Book 68, Hadith 56
Arabic Text
حَدَّثَنِي مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا ابْنُ أَبِي عَدِيٍّ، عَنْ هِشَامِ بْنِ حَسَّانَ، حَدَّثَنَا عِكْرِمَةُ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ أَنَّ هِلاَلَ بْنَ أُمَيَّةَ، قَذَفَ امْرَأَتَهُ، فَجَاءَ فَشَهِدَ وَالنَّبِيُّ صلى الله عليه وسلم يَقُولُ " إِنَّ اللَّهَ يَعْلَمُ أَنَّ أَحَدَكُمَا كَاذِبٌ، فَهَلْ مِنْكُمَا تَائِبٌ ". ثُمَّ قَامَتْ فَشَهِدَتْ.