Charles Ellicott Commentary Leviticus 13:53-54

"And if the priest shall look, and, behold, the plague be not spread in the garment, either in the warp, or in the woof, or in anything of skin; then the priest shall command that they wash the thing wherein the plague is, and he shall shut it up seven days more:" — Leviticus 13:53-54 (ASV)

And if the priest shall look. —If, however, after a week’s quarantine, the priest on examination finds that the disease has not spread, he must order the affected garments to be washed, and shut them up for another week, when it will be seen whether the colour has changed, and the affliction has disappeared or not.