If impure dust settles on dry clothing, a carpet, or similar thing, in the event that the object is shaken in a way that the amount of dust that is certain to have been impure falls off, the clothing, carpet, or similar thing is pure and it is not necessary to wash it. [1] In light of Ruling 215, they become pure by removing the impurity from them, so if this is done, there is no need to wash them with water. 10. Istibrāʾ[1] of an excrement-eating animal 8.