‏النكاح : Hadeeth No:3238 Sa'id b. al-Musayyib reported: I heard Sa'd (b. Abi Waqqas) saying that the idea of 'Uthman b. Maz'un for living in celibacy was rejected (by the Prophet), and if he had been given permission they would have got themselves castrated....

‏الإيمان : Hadeeth No:166 It is narrated on the authority of 'Abdullah that the Prophet of Allaah (sallAllaahu alayhi wa sallam) observed: He who as in his heart the weight of a mustard seed of pride shall not enter Paradise....