What is the ruling on castration for one who is unable to abandon masturbation, fornication, or gazing [at that which is unlawful]?

It is not permissible to proceed with castration, as it involves severing offspring and altering Allah's creation. The Prophet, peace and blessings be upon him, guided those who experienced an surge in their desires to fast if they were unable to marry. The castration of his Ummah is fasting and prayer.