This shall be the law of the leper, in the day of his cleansing,.... Or the rules, rites, ceremonies, and sacrifices to be observed therein. Jarchi says, from hence we learn that they were not to purify a leper in the night:

he shall be brought unto the priest: not into the camp, or city, or house, where the priest was, for till he was cleansed he could not be admitted into either; besides, the priest is afterwards said to go forth out of the camp to him; but he was to be brought pretty near the camp or city, where the priest went to meet him. As the leper was an emblem of a polluted sinner, the priest was a type of Christ, to whom leprous sinners must be brought for cleansing; they cannot come of themselves to him, that is, believe in him, except it be given unto them; or they are drawn with the powerful and efficacious grace of God, by which souls are brought to Christ, and enabled to believe in him; not that they are brought against their wills, but being drawn with the cords of love, and through the power of divine grace, sweetly operating upon their hearts, they move towards him with all readiness and willingness, and cast themselves at his feet, saying, as the leper that came to Christ, "Lord, if thou wilt, thou canst make me clean", Matthew 8:2 Mark 1:40; and it is grace to allow them to come near him, and amazing goodness in him to receive and cleanse them.

The first act (Leviticus 14:2-8) set forth the restoration of the man, who had been regarded as dead, into the fellowship of the living members of the covenant nation, and was therefore performed by the priest outside the camp.

Leviticus 14:2-4

On the day of his purification the priest was to examine the leper outside the camp; and if he found the leprosy cured and gone (מן נרפּא, const. praegnans, healed away from, i.e., healed and gone away from), he was to send for (lit., order them to fetch or bring) two living (חיּות, with all the fulness of their vital power) birds (without any precise direction as to the kind, not merely sparrows), and (a piece of) cedar-wood and coccus (probably scarlet wool, or a little piece of scarlet cloth), and hyssop (see at Exodus 12:22).

This shall be the {a} law of the leper in the day of his cleansing: He shall be brought unto the priest:

(a) Or, the ceremony which shall be used in his purgation.

14:2 He shall be brought to the priest - Not into the priest's house, but to some place without the camp or city, which the priest shall appoint.

2, 3. law of the leper in the day of his cleansing-Though quite convalescent, a leper was not allowed to return to society immediately and at his own will. The malignant character of his disease rendered the greatest precautions necessary to his re-admission among the people. One of the priests most skilled in the diagnostics of disease [Grotius], being deputed to attend such outcasts, the restored leper appeared before this official, and when after examination a certificate of health was given, the ceremonies here described were forthwith observed outside the camp.

14:1-9 The priests could not cleanse the lepers; but when the Lord removed the plague, various rules were to be observed in admitting them again to the ordinances of God, and the society of his people. They represent many duties and exercises of truly repenting sinners, and the duties of ministers respecting them. If we apply this to the spiritual leprosy of sin, it intimates that when we withdraw from those who walk disorderly, we must not count them as enemies, but admonish them as brethren. And also that when God by his grace has brought to repentance, they ought with tenderness and joy, and sincere affection, to be received again. Care should always be taken that sinners may not be encouraged, nor penitents discouraged. If it were found that the leprosy was healed, the priest must declare it with the particular solemnities here described. The two birds, one killed, and the other dipped in the blood of the bird that was killed, and then let loose, may signify Christ shedding his blood for sinners, and rising and ascending into heaven. The priest having pronounced the leper clean from the disease, he must make himself clean from all remains of it. Thus those who have comfort of the remission of their sins, must with care and caution cleanse themselves from sins; for every one that has this hope in him, will be concerned to purify himself.