Language:
كتاب الطلاق
68  
Divorce
(33)
Chapter: "Surely one of you two is a liar; so will one of you repent (to Allah)?"
(33)
باب قَوْلِ الإِمَامِ لِلْمُتَلاَعِنَيْنِ إِنَّ أَحَدَكُمَا كَاذِبٌ فَهَلْ مِنْكُمَا تَائِبٌ
Sahih al-Bukhari 5312

Narrated Sa`id bin Jubair:

I asked Ibn `Umar about those who were involved in a case of Lien. He said, "The Prophet (ﷺ) said to those who were involved in a case of Lien, 'Your accounts are with Allah. One of you two is a liar, and you (the husband) have no right over her (she is divorced)." The man said, 'What about my property (Mahr) ?' The Prophet (ﷺ) said, 'You have no right to get back your property. If you have told the truth about her then your property was for the consummation of your marriage with her; and if you told a lie about her, then you are less rightful to get your property back.' " Sufyan, a sub-narrator said: I learned the Hadith from `Amr. Narrated Aiyub: I heard Sa`id bin Jubair saying, "I asked Ibn `Umar, 'If a man (accuses his wife for an illegal sexual intercourse and) carries out the process of Lian (what will happen)?' Ibn `Umar set two of his fingers apart. (Sufyan set his index finger and middle finger apart.) Ibn `Umar said, 'The Prophet (ﷺ) separated the couple of Bani Al-Ajlan by divorce and said thrice, "Allah knows that one of you two is a liar; so will one of you repent (to Allah)?' "

حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، قَالَ عَمْرٌو سَمِعْتُ سَعِيدَ بْنَ جُبَيْرٍ، قَالَ سَأَلْتُ ابْنَ عُمَرَ عَنِ الْمُتَلاَعِنَيْنِ،، فَقَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم لِلْمُتَلاَعِنَيْنِ ‏"‏ حِسَابُكُمَا عَلَى اللَّهِ أَحَدُكُمَا كَاذِبٌ، لاَ سَبِيلَ لَكَ عَلَيْهَا ‏"‏‏.‏ قَالَ مَالِي قَالَ ‏"‏ لاَ مَالَ لَكَ، إِنْ كُنْتَ صَدَقْتَ عَلَيْهَا، فَهْوَ بِمَا اسْتَحْلَلْتَ مِنْ فَرْجِهَا، وَإِنْ كُنْتَ كَذَبْتَ عَلَيْهَا، فَذَاكَ أَبْعَدُ لَكَ ‏"‏‏.‏ قَالَ سُفْيَانُ حَفِظْتُهُ مِنْ عَمْرٍو‏.‏ وَقَالَ أَيُّوبُ سَمِعْتُ سَعِيدَ بْنَ جُبَيْرٍ قَالَ قُلْتُ لاِبْنِ عُمَرَ رَجُلٌ لاَعَنَ امْرَأَتَهُ فَقَالَ بِإِصْبَعَيْهِ ـ وَفَرَّقَ سُفْيَانُ بَيْنَ إِصْبَعَيْهِ السَّبَّابَةِ وَالْوُسْطَى ـ فَرَّقَ النَّبِيُّ صلى الله عليه وسلم بَيْنَ أَخَوَىْ بَنِي الْعَجْلاَنِ، وَقَالَ ‏"‏ اللَّهُ يَعْلَمُ إِنَّ أَحَدَكُمَا كَاذِبٌ فَهَلْ مِنْكُمَا تَائِبٌ ‏"‏‏.‏ ثَلاَثَ مَرَّاتٍ‏.‏ قَالَ سُفْيَانُ حَفِظْتُهُ مِنْ عَمْرٍو وَأَيُّوبَ كَمَا أَخْبَرْتُكَ‏.‏
Reference : Sahih al-Bukhari 5312
In-book reference : Book 68, Hadith 61
USC-MSA web (English) reference : Vol. 7, Book 63, Hadith 232
  (deprecated numbering scheme)