Hadith 1:130
Narrated Abu Huraira (rad):
Allah’s Messenger (ﷺ) said that, “If one of you sits between her legs (of a woman) and penetrates her, Ghusl (bath) is obligatory.” [Agreed upon].
وَعَنْ أَبِي هُرَيْرَةَ - رضى الله عنه - قَالَ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ إِذَا جَلَسَ بَيْنَ شُعَبِهَا اَلْأَرْبَعِ, ثُمَّ جَهَدَهَا, فَقَدْ وَجَبَ اَلْغُسْلُ } مُتَّفَقٌ عَلَيْه ِ (130)
Original Reference: Bulugh al-Maram 110