Sahih al-Bukhari Book 68, Hadith 59
Ibn `Abbas; said, "Once Lian was mentioned before the Prophet (ﷺ) whereupon `Asim bin Adi said
something and went away. Then a man from his tribe came to him, complaining that he had found a
man with his wife. `Asim said, 'I have not been put to task except for my statement (about Lian).'
`Asim took the man to the Prophet (ﷺ) and the man told him of the state in which he had found his wife.
The man was pale, thin, and of lank hair, while the other man whom he claimed he had seen with his
wife, was brown, fat and had much flesh on his calves. The Prophet (ﷺ) invoked, saying, 'O Allah! Reveal
the truth.' So that lady delivered a child resembling the man whom her husband had mentioned he had
found her with. The Prophet (ﷺ) then made them carry out Lian." Then a man from that gathering asked
Ibn `Abbas, "Was she the same lady regarding which the Prophet (ﷺ) had said, 'If I were to stone to death
someone without witness, I would have stoned this lady'?" Ibn `Abbas said, "No, that was another
lady who, though being a Muslim, used to arouse suspicion by her outright misbehavior. "
Ibn Shihab informed me of Lian and the tradition related to it, referring to the narration of Sahl bin Sa`d, the brother of Bani Sa`idi He said, "An Ansari man came to Allah's Messenger (ﷺ) and said, 'O Allah's Apostle! If a man saw another man with his wife, should he kill him, or what should he do?' So Allah revealed concerning his affair what is mentioned in the Holy Qur'an about the affair of those involved in a case of Lian. The Prophet (ﷺ) said, 'Allah has given His verdict regarding you and your wife.' So they carried out Lian in the mosque while I was present there. When they had finished, the man said, "O Allah's Messenger (ﷺ)! If I should now keep her with me as a wife then I have told a lie about her. Then he divorced her thrice before Allah's Messenger (ﷺ) ordered him, when they had finished the Lian process. So he divorced her in front of the Prophet (ﷺ) ." Ibn Shihab added, "After their case, it became a tradition that a couple involved in a case of Lian should be separated by divorce. That lady was pregnant then, and later on her son was called by his mother's name. The tradition concerning their inheritance was that she would be his heir and he would inherit of her property the share Allah had prescribed for him." Ibn Shihab said that Sahl bin Sa`d As'Saidi said that the Prophet (ﷺ) said (in the above narration), "If that lady delivers a small red child like a lizard, then the lady has spoken the truth and the man was a liar, but if she delivers a child with black eyes and huge lips, then her husband has spoken the truth." Then she delivered it in the shape one would dislike (as it proved her guilty).
I asked Ibn `Umar, "(What is the verdict if) a man accuses his wife of illegal sexual intercourse?" Ibn `Umar said, "The Prophet (ﷺ) separated (by divorce) the couple of Bani Al-Ajlan, and said, (to them), 'Allah knows that one of you two is a liar; so will one of you repent?' But both of them refused. He again said, 'Allah knows that one of you two is a liar; so will one of you repent?' But both of them refused. So he separated them by divorce." (Aiyub, a sub-narrator said: `Amr bin Dinar said to me, "There is something else in this Hadith which you have not mentioned. It goes thus: The man said, 'What about my money (i.e. the Mahr that I have given to my wife)?' It was said, 'You have no right to restore any money, for if you have spoken the truth (as regards the accusation), you have also consummated your marriage with her; and if you have told a lie, you are less rightful to have your money back.' ")