And he shall take to cleanse the house two birds, and cedar wood, and scarlet, and hyssop:
This is the law concerning the leprosy in a house. Now that they were in the wilderness they dwelt in tents, and had no houses, and therefore the law is made only an appendix to the former laws concerning the leprosy, because it related, not to their present state, but to their future settlement.
Commenting on Leviticus 14:33-53
And for a rising, and for a scab, and for a bright spot. Which were three sorts of leprosy in the skin of man's flesh; See Gill on Lev 13:2. Leviticus 14:57
And he shall take to cleanse the house two birds, and cedar wood, and scarlet, and hyssop: (o) It seems that this was a lace or string to bind the hyssop to the wood, and so was made a sprinkle: the apostle to the Hebrews calls it scarlet wool, .