John Calvin's Commentary on the Bible - Leviticus 13:2
Verse 2 2.When a man shall have in the skin. Since every eruption was not the leprosy, and did not render a man unclean, when God appoints the priests to be the judges, He distinguishes by certain marks a common eruption from the leprosy; and then subjoins the difference between the various kinds of leprosy. For the disease was not always incurable; but, only when the blood was altogether corrupted, so that the skin itself had become hardened by its corrosion, or swollen by its diseased state.... read more
Adam Clarke's Commentary on the Bible - Leviticus 13:3
The priest shall - pronounce him unclean - אתו וטמא vetimme otho ; literally, shall pollute him, i. e., in the Hebrew idiom, shall declare or pronounce him polluted; and in Leviticus 13:23 , it is said, the priest shall pronounce him clean, הכהן וטהרו vetiharo haccohen , the priest shall cleanse him, i. e., declare him clean. In this phrase we have the proper meaning of Matthew 16:19 ; : Whatsoever ye bind on earth, shall be bound in heaven; and whatsoever ye loose on earth shall... read more