Sahih Al Bukhari (88)

حَدَّثَنَا مُحَمَّدُ بْنُ مُقَاتِلٍ أَبُو الحَسَنِ، قَالَ: أَخْبَرَنَا عَبْدُ اللَّهِ، قَالَ: أَخْبَرَنَا عُمَرُ بْنُ سَعِيدِ بْنِ أَبِي حُسَيْنٍ، قَالَ: حَدَّثَنِي عَبْدُ اللَّهِ بْنُ أَبِي مُلَيْكَةَ، عَنْ عُقْبَةَ بْنِ الحَارِثِ، أَنَّهُ تَزَوَّجَ ابْنَةً لِأَبِي إِهَابِ بْنِ عُزَيْزٍ فَأَتَتْهُ امْرَأَةٌ فَقَالَتْ: إِنِّي قَدْ أَرْضَعْتُ عُقْبَةَ وَالَّتِي تَزَوَّجَ، فَقَالَ لَهَا عُقْبَةُ: مَا أَعْلَمُ أَنَّكِ أَرْضَعْتِنِي، وَلاَ أَخْبَرْتِنِي، فَرَكِبَ إِلَى رَسُولِ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ بِالْمَدِينَةِ فَسَأَلَهُ، فَقَالَ رَسُولُ اللَّهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: «كَيْفَ وَقَدْ قِيلَ» فَفَارَقَهَا عُقْبَةُ، وَنَكَحَتْ زَوْجًا غَيْرَهُ

`Abdullah ibn Abu Mulaykah reported: `Uqbah ibn Al Harith said that he had married the daughter of Abu Ihab ibn `Aziz. Later on a woman came to him and said: "I have suckled (nursed) `Uqbah and the woman whom he married (his wife)." `Uqbah said to her: "Neither I knew that you have suckled (nursed) me nor did you tell me." Then he rode over to see Allah's Messenger (peace be upon him) at Medina, and asked him about it. Allah's Messenger (peace be upon him) said: "How can you keep her as a wife when it has been said (that she is your foster-sister)?" Then `Uqbah divorced her, and she married another man.