Sahih al-Bukhari, Book 65, Hadith 4745 (In-Book) ⓘ

Narrated Sahl bin Saud: 'Uwaimir came to `Asim bin `Adi who was the chief of Bani Ajlan and said, "What do you say about a man who has found another man with his wife? Should he kill him whereupon you would kill him (i.e. the husband), or what should he do? Please ask Allah's Messenger about this matter on my behalf." `Asim then went to the Prophet and said, "O Allah's Messenger! (And asked him that question) but Allah's Messenger disliked the question," When 'Uwaimir asked `Asim (about the Prophet's answer) `Asim replied that Allah's Messenger disliked such questions and considered it shameful. "Uwaimir then said, "By Allah, I will not give up asking unless I ask Allah's Messenger about it." Uwaimir came (to the Prophet ) and said, "O Allah's Messenger! A man has found another man with his wife! Should he kill him whereupon you would kill him (the husband, in Qisas) or what should he do?" Allah's Messenger said, "Allah has revealed regarding you and your wife's case in the Qur'an "So Allah's Messenger ordered them to perform the measures of Mula'ana according to what Allah had mentioned in His Book. So 'Uwaimir did Mula'ana with her and said, "O Allah's Messenger! If I kept her I would oppress her." So 'Uwaimir divorced her and so divorce became a tradition after them for those who happened to be involved in a case of Mula'ana. Allah's Messenger then said, "Look! If she (Uwaimir's wife) delivers a black child with deep black large eyes, big hips and fat legs, then I will be of the opinion that 'Uwaimir has spoken the truth; but if she delivers a red child looking like a Wahra then we will consider that 'Uwaimir has told a lie against her." Later on she delivered a child carrying the qualities which Allah's Messenger had mentioned as a proof for 'Uwaimir's claim; therefore the child was ascribed to its mother henceforth.

حَدَّثَنَا إِسْحَاقُ، حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ، حَدَّثَنَا الأَوْزَاعِيُّ، قَالَ حَدَّثَنِي الزُّهْرِيُّ، عَنْ سَهْلِ بْنِ سَعْدٍ، أَنَّ عُوَيْمِرًا، أَتَى عَاصِمَ بْنَ عَدِيٍّ وَكَانَ سَيِّدَ بَنِي عَجْلاَنَ فَقَالَ كَيْفَ تَقُولُونَ فِي رَجُلٍ وَجَدَ مَعَ امْرَأَتِهِ رَجُلاً، أَيَقْتُلُهُ فَتَقْتُلُونَهُ أَمْ كَيْفَ يَصْنَعُ سَلْ لِي رَسُولَ اللَّهِ صلى الله عليه وسلم عَنْ ذَلِكَ فَأَتَى عَاصِمٌ النَّبِيَّ صلى الله عليه وسلم فَقَالَ يَا رَسُولَ اللَّهِ، فَكَرِهَ رَسُولُ اللَّهِ صلى الله عليه وسلم الْمَسَائِلَ، فَسَأَلَهُ عُوَيْمِرٌ فَقَالَ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَرِهَ الْمَسَائِلَ وَعَابَهَا، قَالَ عُوَيْمِرٌ وَاللَّهِ لاَ أَنْتَهِي حَتَّى أَسْأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنْ ذَلِكَ فَجَاءَ عُوَيْمِرٌ فَقَالَ يَا رَسُولَ اللَّهِ رَجُلٌ وَجَدَ مَعَ امْرَأَتِهِ رَجُلاً، أَيَقْتُلُهُ فَتَقْتُلُونَهُ أَمْ كَيْفَ يَصْنَعُ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ قَدْ أَنْزَلَ اللَّهُ الْقُرْآنَ فِيكَ وَفِي صَاحِبَتِكَ ‏"‏‏.‏ فَأَمَرَهُمَا رَسُولُ اللَّهِ صلى الله عليه وسلم بِالْمُلاَعَنَةِ بِمَا سَمَّى اللَّهُ فِي كِتَابِهِ، فَلاَعَنَهَا ثُمَّ قَالَ يَا رَسُولَ اللَّهِ، إِنْ حَبَسْتُهَا فَقَدْ ظَلَمْتُهَا، فَطَلَّقَهَا، فَكَانَتْ سُنَّةً لِمَنْ كَانَ بَعْدَهُمَا فِي الْمُتَلاَعِنَيْنِ، ثُمَّ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ انْظُرُوا فَإِنْ جَاءَتْ بِهِ أَسْحَمَ أَدْعَجَ الْعَيْنَيْنِ عَظِيمَ الأَلْيَتَيْنِ خَدَلَّجَ السَّاقَيْنِ فَلاَ أَحْسِبُ عُوَيْمِرًا إِلاَّ قَدْ صَدَقَ عَلَيْهَا، وَإِنْ جَاءَتْ بِهِ أُحَيْمِرَ كَأَنَّهُ وَحَرَةٌ فَلاَ أَحْسِبُ عُوَيْمِرًا، إِلاَّ قَدْ كَذَبَ عَلَيْهَا ‏"‏‏.‏ فَجَاءَتْ بِهِ عَلَى النَّعْتِ الَّذِي نَعَتَ بِهِ رَسُولُ اللَّهِ صلى الله عليه وسلم مِنْ تَصْدِيقِ عُوَيْمِرٍ، فَكَانَ بَعْدُ يُنْسَبُ إِلَى أُمِّهِ‏.‏