Sahih Muslim 1402bBook 16, Hadith 8
وَحَدَّثَنِي أَبُو عِمْرَانَ، مُحَمَّدُ بْنُ جَعْفَرِ بْنِ زِيَادٍ حَدَّثَنَا إِبْرَاهِيمُ بْنُ سَعْدٍ، عَنِ ابْنِ، شِهَابٍ الزُّهْرِيِّ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، قَالَ سَمِعْتُ سَعْدًا، يَقُولُ رُدَّ عَلَى عُثْمَانَ بْنِ مَظْعُونٍ التَّبَتُّلُ وَلَوْ أُذِنَ لَهُ لاَخْتَصَيْنَا .
I heard Sa'd (b. Abi Waqqas) saying that the idea of 'Uthman b. Maz'un for living in celibacy was rejected (by the Holy Prophet), and if he had been given permission they would have got themselves castrated.