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.
Cross-references
Leviticus 13:2 describes the initial report of a skin condition that the priest must then examine in this verse.
Leviticus 13:8 continues the procedure: after a 7-day quarantine, if the disease spreads, it confirms the leprosy first suspected in 13:3.
Leviticus 13:10 adds another diagnostic sign (raw flesh) for the same skin disease, parallel to the criteria in 13:3.
Leviticus 13:20 applies the same priestly examination to a boil, showing consistent rules for different skin conditions.
Leviticus 10:10 gives the general priestly duty to distinguish clean/unclean, which this verse exemplifies in diagnosing leprosy.
Leviticus 22:4 applies the uncleanness from 13:3 to priests, barring them from eating sacred offerings until cleansed.
Leviticus 14:37 extends the priest's examination to a house with mildew — same principle of contamination and separation, different subject.
In Matthew 18:17, treating an unrepentant believer as a pagan mirrors the priest declaring a leper unclean and separating them from the community.
In John 20:23, the apostles' authority to forgive or retain sins parallels the priest's authority to pronounce clean or unclean here.
In 2 Timothy 2:17, false teaching spreading like gangrene mirrors the contagious spread of leprosy that the priest judges in this verse.
Numbers 12:10 narrates Miriam being struck with leprosy as white as snow, an example of the disease described in 13:3.
2 Kings 5:1 introduces Naaman, a leper — showing the same condition from Leviticus 13:3 affecting a non-Israelite commander.
In Matthew 16:19, Peter receives authority to bind and loose, echoing the priest's role to pronounce clean or unclean in this verse.
Ezekiel 44:23 reiterates the priest's role in teaching clean/unclean distinctions, mirroring the diagnostic task of this verse.
Hosea 7:9 mentions gray hairs unnoticed—like the white hair in leprosy—highlighting unrecognized spiritual decline.
In Matthew 18:18, binding and loosing on earth corresponds to the priest's binding judgment of uncleanness in this verse.