The Islamic faith has particular rules regarding personal hygiene when going to the toilet. This code of Muslim hygienical jurisprudence is known as Qadaa' al-Haajah.
The only issue which the Qur'an mentions is the one of washing one's hands (). Issues of chirality (bodily symmetry), such as whether one uses the left or right hand, and which foot is used to step into or out of toilet areas, are derived from hadith sources.
A Muslim must first find an acceptable place away from standing water, or people's pathways or shade. They are advised that it is better to enter the area with the left foot, facing away from the Qiblah.
While on the toilet, one must remain silent. Talking, answering greetings or greeting others is strongly discouraged. When defecating together, two men cannot converse, nor look at each other's genitals. A man should not touch his genitals with the right hand. Eating any food while on the toilet is strictly forbidden.
The anus must be washed with water after defecating. Similarly, the penis and vulva must be washed with water after urinating. This washing is known as istinja. The Qur'an suggests that one should wash one's hands as well, which is discussed in .
When leaving the toilet, one is advised to leave with the right foot, and also say a prayer – "Praise be to Allah who relieved me of the filth and gave me relief." It is also reported in the hadith of Bukhari that whenever Muhammad went to the toilet, he said "In the name of Allah, O Allah! I seek refuge with You from all offensive and wicked things" (alternate translation: "from evil deeds and evil spirits").