Leviticus 13:3

And the priest shall look on the plague in the skin of the flesh: and [when] the hair in the plague is turned white, and the plague in sight [be] deeper than the skin of his flesh, it [is] a plague of leprosy: and the priest shall look on him, and pronounce him unclean.

Ver. 3. The plague in the skin of the flesh.] That is, the white bright spot. Lev 13:2 Compare Exo 4:6 Numbers 12:10 .

Is turned white.] This might note such as have continued long and are aged in any wickedness.

Be deeper than the skin of his flesh.] Compare Numbers 12:12 2 Kings 5:14. Such are they whose wickedness is not only acted by their hands, but seated in their hearts and sunk into their spirits: like the spots of the leopard, which no art can cure, no water wash off, because they are not in the skin, but in the flesh and bones, in the sinews and most inner parts. Ingrained diseases are not easily stirred, much less destroyed.