It was narrated that 'Aishah said:
"Once of the things that Allah revealed in the the Qur'an and then abrogated was that nothing makes marriage prohibited except ten breastfeedings or five well-known (breastfeedings)." (TR)
English reference (TR): Vol. 3, Book 9, Hadith 1942 (TR)
Arabic reference (TR): Book 9, Hadith 2018 (TR)