This is based on the agreement of the scholars that the stones purify the directors, and they differed except for what we mentioned of the agreement on fluids and solids that remove impurities from the places we mentioned. So who says that every fluid and solid in any place, if it is pure, then it removes the essence of impurity, and I say so, and who says: Absolutely prohibited, except for what was agreed upon regarding water and sterilization, which we have mentioned