Muwatta Malik #103
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، وَعُثْمَانَ بْنَ عَفَّانَ، وَعَائِشَةَ، زَوْجَ النَّبِيِّ صلى الله عليه وسلم كَانُوا يَقُولُونَ إِذَا مَسَّ الْخِتَانُ الْخِتَانَ فَقَدْ وَجَبَ الْغُسْلُ .
Yahya related to me from Malik from Ibn Shihab from Said ibn al-
Musayyab that Umar ibn al-Khattab and Uthman ibn Affan and A'isha, the
wife of the Prophet, may Allah bless him and grant him peace, used to
say, "When the circumcised part touches the circumcised part, ghusl is
obligatory."
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About Muwatta Malik
This hadith is #103 from Muwatta Malik, in the Book of Purity.