Chapter on Ghusl
What makes it obligatory is the emission of semen in a forceful gush accompanied by pleasure...
That is, this chapter addresses both what makes ghusl obligatory and how it is performed.
His statement, “what makes it obligatory,” uses mūjib with the jīm vowelled kasrah; that is, the thing which makes ghusl obligatory. The word mūjib may be pronounced with the jīm vowelled either kasrah or fatḥah.
With kasrah, it means that which makes something else obligatory; with fatḥah, it means that which has become obligatory because of something else. Similarly, muqtaḍī, with the ḍād vowelled kasrah, means that which entails something else, whereas muqtaḍā, with the ḍād vowelled fatḥah, means that which is entailed by something else.
His statement, “the emission of semen in a forceful gush accompanied by pleasure”: this is the first cause requiring ghusl (1).
The evidence for this is as follows:
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Allah’s saying: “If you are in a state of major ritual impurity, then purify yourselves.” [al-Ma’idah: 6] The junub is one from whom semen has been emitted in a forceful gush accompanied by pleasure.
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The Prophet, peace and blessings be upon him, said: “Water is due because of water.” (2) The first “water” refers to the water used for ghusl, while the second refers to semen; that is, when semen is emitted, ghusl becomes obligatory.
The apparent meaning of the hadith is that ghusl is obligatory whether semen is emitted in a forceful gush accompanied by pleasure or otherwise. This was the view of al-Shafi‘i, may Allah have mercy on him: that the emission of semen in all circumstances