Leviticus 13:54

then the priest shall give directions, and [one] shall wash that on which there may have been the plague, and the priest shall set it aside a second time for seven days.

Then the priest shall command that they wash the thing wherein the plague is, and he shall shut it up seven days more:

then the priest shall command that they wash the thing that the plague is in, and he shall isolate it seven more days.