´Sa'eed bin Al-Musayyab narrated from Sa'b bin Abi Waqqas:` "The Messenger of Allah refused Uthman bin Ma'zun (when he asked) regarding celibacy, and if he had permitted it for him, then we would have castrated ourselves."
Hadith Referenceسنن ترمذي / كتاب النكاح عن رسول الله صلى الله عليه وسلم / 1083