Then shall the priest command to take for him that is to be cleansed two birds alive and {b} clean, and cedar wood, and scarlet, and hyssop:

(b) Of birds which were permitted to be eaten.

Wesley's Notes

14:4 Two birds - The one to represent Christ as dying for his sins, the other to represent him as rising again for his purification or justification. Clean - Allowed for food and for sacrifice. Cedar - wood - A stick of cedar, to which the hyssop and one of the birds was tied by the scarlet thread. Cedar seems to be chosen, to note that the leper was now freed from that corruption which his leprosy had brought upon him, that kind of wood being in a manner incorruptible. Scarlet - A thread of wool of a scarlet colour, to represent both the leper's sinfulness, and the blood of Christ, and the happy change of the leper's colour and complexion, which before was wan and loathsome, now sprightly and beautiful. Hyssop - The fragrant smell of which, signified the cure of the leper's ill scent.

King James Translators' Notes

birds: or, sparrows

Scofield Reference Notes

[1] birds

The bird slain, and the live bird, dipped in blood and released, present the two aspects of salvation in Rom 4:25 "delivered for our offences, and raised again for our justification."

Jamieson-Fausset-Brown Bible Commentary

4. two birds-literally, "sparrows." The Septuagint, however, renders the expression "little birds"; and it is evident that it is to be taken in this generic sense from their being specified as "clean"-a condition which would have been altogether superfluous to mention in reference to sparrows. In all the offerings prescribed in the law, Moses ordered only common and accessible birds; and hence we may presume that he points here to such birds as sparrows or pigeons, as in the desert it might have been very difficult to procure wild birds alive.

cedar-wood, and scarlet, and hyssop-The cedar here meant was certainly not the famous tree of Lebanon, and it is generally supposed to have been the juniper, as several varieties of that shrub are found growing abundantly in the clefts and crevices of the Sinaitic mountains. A stick of this shrub was bound to a bunch of hyssop by a scarlet ribbon, and the living bird was to be so attached to it, that when they dipped the branches in the water, the tail of the bird might also be moistened, but not the head nor the wings, that it might not be impeded in its flight when let loose.

Matthew Henry's Concise Commentary

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.