John Gill Commentary Leviticus 14:43

"And if the plague come again, and break out in the house, after that he hath taken out the stones, and after he hath scraped the house, and after it is plastered;" — Leviticus 14:43 (ASV)

And if the plague come again, and break out in the house In the above signs of it: after that he has taken away the stones; which were infected, or ordered them to be taken away: and after he has scraped the house; so that there seemed to be no remains of the plague: and after it is plastered; to prevent if possible any return of it, but in vain.