Then the priest shall command that they take away the stones
in which the plague [is]
In there appeared any cavities, or the above colours, and these spreading: in order to put a stop thereunto, these stones were to be drawn or pulled out, as the word signifies, in such manner as not to endanger the fall of the house, and two stones at least were to be taken out; for, as Gersom says, a house was not shut up unless the plague appeared on two stones: and they shall cast them into an unclean place without the city;
where dead carcasses were laid, and dung, and filth of every sort; and being laid in such a place, it would be known that they were unclean, as Aben Ezra observes, and so would not be made use of for any purpose.