Istinja^[1] is the Islamic term for the action of using water to clean oneself after urinating and/or defecating.

Istinja is obligatory; this means removing whatever has been passed from the genitals or the rectum with water. Toilet paper and other clean implements like stones can be used in addition to water to aid in purifying the area. Istijmar is the equivalent action just using stones, toilet paper, or anything else that is pure without the water.

The aim of this is to remove the impurity and maintain hygiene in accordance with Islamic law and principles.

Water is standard for toilet hygiene within Muslim homes and countries, where a series of vessels that carry water (such as the tabo/cebok in Maritime Southeast Asia, the buta in West Africa, or lota/bodna in the Indian subcontinent) and internationally, the shattaf bidet shower, are used instead of, or in addition to, toilet roll.