14:53. And when he hath let go the sparrow to fly freely away into the field, he shall pray for the house: and it shall be rightly cleansed.
14:54. This is the law of every kind of leprosy and stroke.
14:55. Of the leprosy of garments and houses,
14:56. Of a scar and of blisters breaking out of a shining spot, and when the colours are diversely changed:
14:57. That it may be known when a thing is clean or unclean.
Leviticus Chapter 15
Other legal uncleannesses.
15:1. And the Lord spoke to Moses and Aaron, saying:
15:2. Speak to the children of Israel, and say to them: The man that hath an issue of seed, shall be unclean.
Issue of seed shall be unclean.... These legal uncleannesses were instituted in order to give the people a horror of carnal impurities.