(14) باب شَهَادَةِ الْمُرْضِعَةِ
Narrated `Uqba bin Al-Harith:
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.
Reference: Sahih al-Bukhari 2660
In-book reference: Book 52, Hadith 24
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 48, Hadith 828