Leviticus 14:33-57
Leprosy in the house is a type of sin in an assembly, or even in that which bears the name of Church, Christendom in its entirety. Taking a close look at the church at Ephesus in ch. 2 of the Revelation, we there discern, or rather the Lord, (the great Priest whose eyes are like a flame of fire) discerns there already a small suspicious spot: the leaving of first love. Everything else seems good: works, labour, patience; but see what becomes of that small beginning: real leprosy at Pergamos, where certain stones in the house are tainted with the "doctrine of Balaam", others with that of the Nicolaitanes. Then, evil develops like leaven at Thyatira, at Sardis, until, at Laodicea, which marks the final state of the responsible Church, the Lord is obliged to announce, "I will spue thee out of my mouth" (Revelation 3:16). The "great house" of professing Christendom will be rejected, demolished.
Leviticus 15 develops the subject of defilement. In the type of the "issue" it shows us everything in our everyday life which our detestable natural character is capable of allowing to escape, to poison both our surroundings and ourselves. The remedy exists to cleanse us from it: it is the priesthood exercised on our behalf by the Lord Jesus (vv. 15, 30).