Leviticus 13:41
And he that hath his hair fallen off from the part of his head toward his face, he is forehead bald: yet is he clean. And he that hath his hair fallen off from the part of his head toward his face, he is forehead bald: yet is he clean.
Loss of hair from the front part of the head is forehead baldness, and that condition by itself leaves the person clean and not ceremonially unclean. The instruction belongs to the Mosaic legislation concerning leprosy and sanitation, which also addressed the unsanitary condition of houses. Under that law slight or doubtful symptoms called for quarantine until the condition could be determined, while confirmed leprosy meant permanent separation from home and friends. The confirmed leper and what he touched were treated as unclean, and the leper was required to warn others by crying, Unclean, unclean. Although God is the healer, his people were still required to take proper precautions.
Those sanitary laws given through Moses still stand at the head of sanitary law, and their enduring superiority over modern knowledge proves divine inspiration and guidance. The leprosy laws picture and prefigure sin as a loathsome, terrible, moral and mortal disease. Like leprosy, sin is universally prevalent, inwardly rooted, infectious and contagious, unable to heal by itself and incurable by human means, and it pollutes others through the sinner's influence. Cleansing from that disease comes through Christ, who made the same disease a proof of his power to heal. The figure calls for sin to be removed and for pride and the old self to die. The same loathsome disease is still prevalent in the Holy Land, bearing witness to the truth of Scripture.