(8) باب مَا يُكْرَهُ مِنَ التَّبَتُّلِ وَالْخِصَاءِ
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
In-book reference: Book 67, Hadith 12
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 62, Hadith 12