Leviticus 13:4

“If the bright spot be white in the skin of his flesh, etc.] The Targum of Jonathan is, white as chalk in the skin of his flesh; but other Jewish writers make the whiteness of the bright spot to be the greatest of all, like that of snow; (see Gill on “<031302>Leviticus 13:2”): and in sight [be] not deeper than the skin, and the hair thereof be not turned white; though it be a bright spot, and be very white, yet these two marks not appearing, it cannot be judged a leprosy, at most it is only suspicious: wherefore then the priest, shall shut up [him that hath] the plague seven days; in whom the bright spot is, and of whom there is a suspicion of the plague of leprosy, but it is not certain; and…”

“Seven days - For greater assurance; to teach ministers not to be hasty in their judgments, but diligently to search and examine all things before - hand. The plague is here put for the man that hath the plague. Leviticus 13:6”

“13:4-5 The purpose of a quarantine was primarily diagnostic. It gave the priest an opportunity to examine the patient’s symptoms over a period of time.”

“shut up: Num 12:15; Deu 13:14; Eze 44:10; Co1 4:5; Ti1 5:24 Leviticus 13:6”