Is what the Prophet did not command or forbid included in the ruling of permissibility? And does the rule that what is general cannot be used as an argument if it has been detailed mean that the verse "But whoever seeks beyond that" cannot be used as an argument for the prohibition of masturbation, considering that it is general and the Prophet detailed it in terms of adultery and sodomy, as Al-Shawkani mentioned?

The permissible (mubah) is that which is not subject to a command or prohibition for its own sake. Masturbation is a matter of scholarly disagreement. Al-Shawkani holds that the verse: "And those who guard their private parts..." does not indicate the prohibition of masturbation, and that it is unspecific (mujmal), meaning that guarding the private parts is broader than lawful sexual intercourse (nikah), and masturbation with the hand does not fall under the term nikah.

The preponderant opinion is that guarding the private parts mentioned in the verse is not limited to guarding them in the context of lawful sexual intercourse, and that the verse is not unspecific (mujmal). Rather, it is interpreted according to the customary meaning of using the private parts, which is enjoyment and satisfying desires. This is supported by the generality of verses and hadiths that praise guarding the private parts absolutely and protect them from unlawful uses.