Muhammad ibn Rafi' narrated to us, Hujayn ibn al-Muthanna narrated to us, from Layth, from 'Uqayl, from Ibn Shihab that he said: Sa'id ibn al-Musayyab informed me that he heard Sa'd ibn Abi Waqqas say: 'Uthman ibn Maz'un wanted to devote himself entirely to worship (tabattul), but the Messenger of Allah, peace and blessings be upon him, forbade him from that. And had he permitted it for him, we would have castrated ourselves.