Sahih al-Bukhari 5074
Book 67: Wedlock, Marriage (Nikaah) · Narrated by Sa`d bin Abi Waqqas
Arabic
حَدَّثَنَا أَبُو الْيَمَانِ، أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، قَالَ أَخْبَرَنِي سَعِيدُ بْنُ الْمُسَيَّبِ، أَنَّهُ سَمِعَ سَعْدَ بْنَ أَبِي وَقَّاصٍ، يَقُولُ لَقَدْ رَدَّ ذَلِكَ ـ يَعْنِي النَّبِيَّ صلى الله عليه وسلم ـ عَلَى عُثْمَانَ، وَلَوْ أَجَازَ لَهُ التَّبَتُّلَ لاَخْتَصَيْنَا.
English translation
Narrated Sa`d bin Abi Waqqas:The Prophet (ﷺ) prevented `Uthman bin Mazun from that (not marrying), and had he allowed him, we would have got ourselves castrated
Reference: Sahih al-Bukhari 5074, Book of Wedlock, Marriage (Nikaah). English translation by Dr. Muhammad Muhsin Khan.