Language:
كتاب الطلاق
68  
Divorce
(27)
Chapter: Commanding those who are involved in a case of Li'an to take the oath.
(27)
باب إِحْلاَفِ الْمُلاَعِنِ
Sahih al-Bukhari 5306

Narrated `Abdullah:

An Ansari man accused his wife (of committing illegal sexual intercourse). The Prophet (ﷺ) made both of them takes the oath of Lian, and separated them from each other (by divorce).

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلُ، حَدَّثَنَا جُوَيْرِيَةُ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ ـ رضى الله عنه ـ أَنَّ رَجُلاً مِنَ الأَنْصَارِ قَذَفَ امْرَأَتَهُ فَأَحْلَفَهُمَا النَّبِيُّ صلى الله عليه وسلم ثُمَّ فَرَّقَ بَيْنَهُمَا‏.‏
Reference : Sahih al-Bukhari 5306
In-book reference : Book 68, Hadith 55
USC-MSA web (English) reference : Vol. 7, Book 63, Hadith 226
  (deprecated numbering scheme)