Leviticus 13:27

And the priest shall look upon him the seventh day ,.... When that is come, any time on that day; not needing to wait until the end of it, or till, the seven days are precisely up; the same is to be understood in all places in this chapter where the like is used:

and if it be spread much abroad in the skin ; in the space of seven days:

then the priest shall pronounce him unclean; it is the plague of leprosy : according to the law; so that it was necessary, in such a case for him to conform to it in order to his cleansing.