كتاب الطهارة وسننها
1  
The Book of Purification and its Sunnah
(111)
Chapter: What was narrated about the obligation of bath when the two circumcised parts meet
(111)
باب مَا جَاءَ فِي وُجُوبِ الْغُسْلِ مِنَ الْتِقَاءِ الْخِتَانَيْنِ
Sunan Ibn Majah 609
Ubayy bin Ka'b said:
"That was a concession that was granted in the early days of Islam, then we were commanded to have a bathe after that."
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا عُثْمَانُ بْنُ عُمَرَ، أَنْبَأَنَا يُونُسُ، عَنِ الزُّهْرِيِّ، قَالَ قَالَ سَهْلُ بْنُ سَعْدٍ السَّاعِدِيُّ أَنْبَأَنَا أُبَىُّ بْنُ كَعْبٍ، قَالَ إِنَّمَا كَانَتْ رُخْصَةً فِي أَوَّلِ الإِسْلاَمِ ثُمَّ أُمِرْنَا بِالْغُسْلِ بَعْدُ ‏.‏
Grade: Sahih (Darussalam)
Reference : Sunan Ibn Majah 609
In-book reference : Book 1, Hadith 343
English translation : Vol. 1, Book 1, Hadith 609