Leviticus 14:4 - Clarke's commentary and critical notes on the Bible

Then shall the priest command to take for him that is to be cleansed two birds alive and clean, and cedar wood, and scarlet, and hyssop: Two birds alive and clean, etc. - Whether these birds were sparrows, or turtledoves, or pigeons, we know not; probably any kind of clean bird, or bird proper to be eaten, might be used on this occasion, though it is more likely that turtle-doves or pigeons were employed, because these appear to have been the only birds offered in sacrifice. Of the cedarwood, hyssop, clean bird, and scarlet wool or fillet, were made an aspergillum, or instrument to sprinkle with. The cedar-wood served for the handle, the hyssop and living bird were attached to it by means of the scarlet wool or crimson fillet. The bird was so bound to this handle as that its tail should be downwards, in order to be dipped into the blood of the bird that had been killed. The whole of this made an instrument for the sprinkling of this blood, and when this business was done, the living bird was let loose, and permitted to go whithersoever it would. In this ceremony, according to some rabbins, "the living bird signified that the dead flesh of the leper was restored to soundness; the cedar-wood, which is not easily corrupted, that he was healed of his putrefaction; the scarlet thread, wool, or fillet, that he was restored to his good complexion; and the hyssop, which was purgative and odoriferous, that the disease was completely removed, and the bad scent that accompanied it entirely gone." Ainsworth, Dodd, and others, have given many of these rabbinical conceits. Of all these purifications, and their accompanying circumstances, we may safely say, because authorized by the New Testament so to do, that they pointed out the purification of the soul through the atonement and Spirit of Christ; but to run analogies between the type and the thing typified is difficult, and precarious. The general meaning and design we sufficiently understand; the particulars are not readily ascertainable, and consequently of little importance; had they been otherwise, they would have been pointed out.