The final four verses of this section draw the instructions concerning abnormalities in skin and other coverings (chs13-14) to a conclusion by summarizing them and explaining the purpose of the collection. The emphasis in this whole section is on God"s provision for cleansing so that something corrupt could be consecrated to use again. [source][source][source]
"God requires that anything that has been defiled be cleansed and then reconsecrated to its full use based on the prescribed ritual of the faith." [1][source]
"As the Flood was once necessary to cleanse God"s good creation from the evil that had contaminated it, so the ritual washings were a necessary part of checking the spread of sin and its results in the covenant community." [2][source]
". . . with the coming of Christ, God himself sought out the "lepers" and healed them. Jesus came to seek and save that which was lost. His outreach to the lepers was on a par with his ministry to other sick people and social outcasts, such as tax-collectors and prostitutes.... Jesus" ministry and that of his disciples ( Matthew 10:8) was one which brought reconciliation between God and man. Therefore the old laws isolating men because of their unsightly appearance had become inappropriate and out of date." [3][source]