John Gill Commentary Leviticus 14:44

"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." — Leviticus 14:44 (ASV)

Then the priest shall come and look
On the seventh day of the second week; though, according to Maimonides ^F15 , this was at the end of the third seven day, or on the nineteenth day from his first inspection into it; the seventh day being reckoned for the last of the first week, and the first of the second, and so on: and, behold, [if] the plague is spread in the house ;
after all the above precaution is taken; it [is] a fretting leprosy in the house ;
like that in the garment, (See Gill on Leviticus 13:51): it [is] unclean ;
and so not to be inhabited.

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FOOTNOTES:

• F15: Hilchot Tumaat Tzarat, c. 15. sect. 1, 2.