Sunan An-Nasa'i

Narrated Abu Salamah:It was narrated from Abu Salamah that Abu Hurairah said: ""I said: 'O Messenger of Allah, I am a young man and I fear hardship for myself, but I cannot afford to marry; should I castrate myself?'"" The Prophet turned away from him until he said it three times. Then the Prophet said: ""O Abu Hurairah, the pen is dried concerning what you are going to face, so (it is up to you whether) you castrate yourself or not."" Abu Abdur-Rahman (An-Nasai) said: Al-Awzai did not hear this narration from Az-Zuhri, and this hadith is sahih, Yunus reported it from Az-Zuhri