Leviticus 13:55
"And the priest shall look on the plague, after that it is washed: and, behold, if the plague have not changed his colour, and the plague be not spread; it is unclean; thou shalt burn it in the fire; it is fret inward, whether it be bare within or without."
Cross References (ranked by relevance)
2 Peter 1:9
But he that lacketh these things is blind, and cannot see afar off, and hath forgotten that he was purged from his old sins.
Ezekiel 24:13
In thy filthiness is lewdness: because I have purged thee, and thou wast not purged, thou shalt not be purged from thy filthiness any more, till I have caused my fury to rest upon thee.