This verse is a kind of summary of what has already been said in the previous verses. Perhaps the repetition is to emphasize the symbolic importance of the act. The verse may be introduced with something like “This, then, is how the priest is to purify the house….”

Quoted with permission from Péter-Contesse, René and Ellington, John. A Handbook on Leviticus. (UBS Helps for Translators). New York: UBS, 1990. For this and other handbooks for translators see here .