Takhrij Hadith 1604: "I said: O Allah's Messenger…"

I said: O Allah's Messenger (peace and blessings be upon him)! I am a young man and I am afraid that I may commit prohibited sexual intercourse and I cannot afford to marry. He kept silent, and then repeated my question once again, but he kept silent. I said the same (for the third time) and he remained silent. Then repeated my question (for the fourth time), and only then the Prophet said: O Abu Huraira! The pen has dried after writing what you are going to confront. So (it does not matter whether you) get yourself castrated or not.