“Janabat” is a ritual impurity caused by the discharge of semen or by sexual intercourse; and the person on whom ghusl janabat becomes wajib is known as “junub”. The Qur'an says:
O you who believe! Do not go near prayers (salat) when you are& junub until you have washed yourselves. O you who believe! When you stand up for prayers (salat), . . . if you are junub, then purify (yourselves).
B. THE CAUSES OF GHUSL JANABAT
There are two causes of janabat:
of semen. It does not make any difference whether this discharge is
while awake or in a wet-dream, slight or profuse, intentionally or otherwise,
in lawful way or unlawful (e.g., masturbation). In all these cases ghusl
janabat becomes obligatory (wajib).
If a secretion is discharged from a woman, then it is precautionary wajib for her to do ghusl janabat provided it came with sexual passion and she felt relaxed after it. But if the secretion comes without the sexual passion or without the feeling of relaxation after the discharge, then it is not najis and therefore ghusl is not wajib upon her.
2. Sexual Intercourse. It does not make any difference whether the intercourse was lawful or unlawful, and with or without discharge of semen. In Islamic laws, sexual intercourse is defined as the penetration of the glans into the vagina or anus of the woman. That is, for ghusl janabat to become wajib it is not necessary that full penetration or discharge of semen should take place. In case of sexual intercourse, ghusl janabat becomes wajib on both the man and the woman.
C. THINGS FORBIDDEN FOR A JUNUB
The following four acts are haraam for the junub before performing the ghusl.
1. Touching the writing of the Qur'an, the names and attributes of Allah, the names of the Prophet, the Imams and Fatimah (the daughter of the Prophet).
2. Reciting the verses of the Qur'an in which sajdah (prostration) is wajib. These verses are: verse 15 of chapter 32; verse 15 of chapter 41; verse 62 of chapter 53; and verse 19 of chapter 96. It is better not to recite even a single verse from these chapters.
3. Entering or staying in the mosque. The Qur'an says, “O you who believe!&Nor (are you allowed to enter the masjid) if you are junub until you have washed yourself except passing through.” 44 Based on this verse and relevant ahadith, the mujtahids have concluded that a junub is totally forbidden from staying in the mosque.
Of course, as the verse says, one can pass through the mosques (by entering from one door and leaving from the other). However, this exception of passing through does not apply to the following places: the Masjidu'l-Haraam (the Sacred Mosque at Mecca) Masjidu' n-Nabi (the Mosque of the Prophet at Medina), and shrines of the Imams. A junub cannot even pass through them.
4. Leaving something in or taking it out from a mosque.
D. Things makruh (disliked) for the junub
1. Eating and drinking is makruh for a junub except after doing wuzu or gargling or rinsing the nose.
2. Reciting more than seven verses from the Qur'an. This applies to other than the four chapters with wajib sajdah mentioned above.
3. Touching the cover of the Qur'an.
4. Sleeping without doing wuzu.
E. THE ACTS WHOSE VALIDITY DEPEND ON GHUSL JANABAT
1. Salat (prayers) except salatu'l-mayyit (the prayer for a dead Muslim) which can be performed even in the state of janabat.
2. Wajib tawaf (the circumambulation of the Ka'bah in hajj).
3. Fasting. If someone knowingly remains junub until dawn in Ramadan, his fasting will become invalid (batil).
F. MANNER OF PERFORMING GHUSL
Ghusl is a ritual bath; it involves washing of the whole body. There are two methods of performing ghusl. One is known as ghusl tartibi, and the other is known as ghusl irtimasi.
1. Ghusl Tartibi:
“Ghusl tartibi” means an ordinal bath, performed in three stages.
After washing away the najasat (e.g., semen or blood) from
the body and after niyyat, the body has to be washed in three stages:
First, head down to the neck; then the right side of the body from the shoulder
down to the foot; and lastly, the left side of the body.
2. Ghusl Irtimasi:
“Ghusl irtimasi” means a bath involving immersion of the whole body in the water. It is needless to say that such a ghusl can only be done in a body of water, e.g., a pool, river, lake or sea.
After washing away the semen or blood from the body and
after niyyat, the whole body should be completely immersed in the
water all at once, not gradually. One has to make sure that the water reaches
all parts of the body, including hair and the skin under it.
G. RECOMMENDABLE ACTS OF GHUSL
These recommendable acts are five:
1. Washing both hands upto the elbows three times before the ghusl.
2. Gargling three times.
3. Wiping the hands on the whole body to ensure that every part has been thoroughly washed.
4. Combing the hair with the fingers to ensure that the water reaches the hair-roots.
5. (For men only) Doing istibra' before ghusl janabat. Istibra', in the present context, means “urinating.” The benefit of istibra': If a liquid comes out of one's penis after completing the ghusl, and he doubts whether it is semen or urine, then should he repeat the ghusl or not? If he had done istibra' before the ghusl, then he can assume that the liquid is urine he will not have to repeat the ghusl; he just has to do wuzu for his salat. But, on the other hand, if he had not done istibra' before the ghusl, then he has to assume that it is the remnant of semen and he will have to do the ghusl again.
 Surah Nisa 4:43
 Surah Maidah 5:6