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 ﷺ used to say, "When the circumcised part touches the circumcised part, ghusl is obligatory."
أَنَّ عُمَرَ بْنَ الْخَطَّابِ وَعُثْمَانَ بْنَ عَفَّانَ وَعَائِشَةَ زَوْجَ النَّبِيِّ ﷺ كَانُوا يَقُولُونَ إِذَا مَسَّ الْخِتَانُ الْخِتَانَ فَقَدْ وَجَبَ الْغُسْلُ