John Gill Commentary Leviticus 13:12

"And if the leprosy break out abroad in the skin, and the leprosy cover all the skin of [him that hath] the plague from his head even to his feet, as far as appeareth to the priest;" — Leviticus 13:12 (ASV)

And if a leprosy break out abroad in the skin
Or, if flowering it flowers ^F13 ; the man that has it on him looks like a plant or tree covered with white flowers, being spread all over him in white swellings, bright spots or scabs, as it follows:

and the leprosy cover all the skin of [him that has] the plague, from
his head even to his foot ;
such an one as the leper was that came to Christ for healing, said to be full of leprosy, (Luke 5:12) . And such in a mystical sense is every sinner, whether sensible of it or not, even from the Crown of the head to the sole of the foot, full of the wounds, bruises, and putrefying sores of sin, (Isaiah 1:6) ;

wherever the priest looketh ;
that is, he cannot look any where upon any part of him but he sees the signs of the leprosy on him; and from where the Jewish writers gather, that a priest that inspects leprous persons ought to have a clear sight, and to have both his eyes, and that the inspection should not be made in a dark house.

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FOOTNOTES:

• F13: (xrpt xwrp) (anyousa exanyhsh) , Sept. "florendo floruerit", Montanus; so Drusius & Tigurine version.