What is the wisdom behind the obligation of ghusl upon the person in a state of major ritual impurity (junub), despite the purity of semen? Is it permissible to pray in clothing that has semen on it after ghusl? And what is the wisdom behind the strictness imposed on the junub by preventing him from reciting the Quran and accompanying the angels?

Islamic Sharia is a law of wisdom and reason. Nevertheless, there are ritualistic aspects in its rulings. If one is asked about the wisdom behind certain acts of worship, the answer is to attribute knowledge to Allah and to surrender to His command, whether the wisdom is known or unknown, as happened with Abraham (peace be upon him). It suffices for the believer to know that Allah has commanded him to perform ghusl (ritual bathing) after janabah (state of ritual impurity following sexual activity) to obey.

Nevertheless, ghusl from janabah has a reasonable and understandable wisdom. It instills vitality and strength, replenishes lost energy, and removes sluggishness and laziness. Ibn al-Qayyim stated that performing ghusl after the emission of semen is among the most beneficial things for the body, heart, and soul.

Some contemporary researchers, such as Dr. Abd al-Badi' Hamza Zilli, have investigated the effects of janabah. He mentioned that sexual arousal activates excretory units in the skin that release toxins and toxic chemical substances which settle on the skin's surface. These substances are "kept at bay" on the body (i.e., they become alongside it), and therefore must be removed by ghusl to prevent their re-entry into the body and causing health problems.

The wisdom behind preventing a person in a state of janabah from praying or touching the Qur'an may be explained by this change that occurs in the body, which the Sharia has mandated to be removed through ghusl. The emission of these secretions occurs with the sexual act and not with urine or madhy (pre-seminal fluid) alone, as madhy only requires washing the private parts and not the entire body.

This interpretation remains within the realm of research, and it suffices for a Muslim to submit to Allah's command with certainty that Allah possesses perfect wisdom.