Sahih al-Bukhari 2660
Sahih al-Bukhari · Book 52: Witnesses · The witness of a wet nurse
Narrated `Uqba bin Al-Harith:
حَدَّثَنَا أَبُو عَاصِمٍ ، عَنْ عُمَرَ بْنِ سَعِيدٍ ، عَنِ ابْنِ أَبِي مُلَيْكَةَ ، عَنْ عُقْبَةَ بْنِ الْحَارِثِ ، قَالَ تَزَوَّجْتُ امْرَأَةً فَجَاءَتِ امْرَأَةٌ فَقَالَتْ إِنِّي قَدْ أَرْضَعْتُكُمَا. فَأَتَيْتُ النَّبِيَّ صلى الله عليه وسلم فَقَالَ " وَكَيْفَ وَقَدْ قِيلَ دَعْهَا عَنْكَ " أَوْ نَحْوَهُ.
I married a woman and later on a woman came and said, "I suckled you both." So, I went to the Prophet (to ask him about it). He said, "How can you (keep her as a wife) when it has been said (that you were foster brother and sister)? Leave (divorce) her.