Chapter on Istinjāʾ and the Etiquette of Relieving Oneself
Istinjāʾ is the removal of whatever comes out of either passage with purifying water or with a lawful, clean stone that achieves cleansing.
Complete cleansing with a stone or the like means that nothing remains except a faint trace that only water could remove, and fewer than three wipes that cover the entire area do not suffice.³
Complete cleansing with water is attained when the surface regains its original roughness; a person’s reasonable assumption that this has been achieved is adequate.
It is recommended⁴ to begin istinjāʾ with a stone or its equivalent and then follow it with water. Reversing the order is disliked. Either method is acceptable, though water is superior.
While performing istinjāʾ it is disliked to face the qiblah or to turn one’s back to it.
It is unlawful to use dung, bones, or food—even if it is fodder for an animal—and should one do so, the cleansing is not valid thereafter.