It was narrated that 'Aishah the wife of the Prophet said:
"When the two circumcised parts meet, then bath is obligatory. The Messenger of Allah and I did that, and we bathed." (JA)
English reference (JA): Vol. 1, Book 1, Hadith 608 (JA)
Arabic reference (JA): Book 1, Hadith 651 (JA)