Second: The Prophet ﷺ did not instruct them to wash the vessels after they had finished using them, for there was no necessity for impurity to remain in them.

........

Third: The general principle is: “There is no necessity in medicine.” The reason for this is that a person may be cured without it, and may not be cured by it.

And its semen, and human semen, ............

His statement, “And its semen,” means the semen of an animal whose meat is lawful to eat; that is, it is pure. His words also indicate that it has semen, and the evidence for this is the saying of Allah, the Exalted: “And Allah created every living creature from water.” [al-Nur: 45]

And His saying, the Exalted: “And We made from water every living thing. Will they not then believe?” [al-Anbiya: 30]

If its urine and dung are pure, then its semen is even more deserving of being regarded as pure. Moreover, semen is the origin of this pure animal, and so it too is pure.

His statement, “and human semen,” means that it is pure. Semen is what emerges from a person with sexual desire. It is a thick fluid, described by Allah, the Exalted, in His saying: “Did We not create you from a despised fluid?” [al-Mursalat]. That is, it is thick and does not flow because of its thickness, unlike water, which flows and is not thick; rather, it is fluid. From this fluid the children of Adam were created. Allah, the Exalted, says: “And indeed We created man from an extract of clay. Then We placed him as a drop of fluid in a secure resting place.” [al-Mu'minun]

From this fluid were created the prophets, the awliya, and the utterly truthful,