American Standard Version (ASV):
then the priest shall come in and look; and, behold, if the plague be spread in the house, it is a fretting leprosy in the house: it is unclean.
King James Version (KJV):
Then the priest shall come and look, and, behold, [if] the plague be spread in the house, it [is] a fretting leprosy in the house: it [is] unclean.