Leviticus 14:4

“Then shall the priest command to take for him that is to be cleansed, etc.] The command is by the priest, the taking is by any man, as Ben Gersom observes; anyone whom he shall command, the leper himself, or his friends. Aben Ezra interprets it, the priest shall take of his own; but he adds, there are some that explain it, the leper shall give them to him, namely, what follows: two birds alive, [and] clean; any sort of birds, to whom this description agrees; for not any particular sort are pointed out, as “sparrows” f474, as some render the word, or any other; because either they must be clean or unclean; if unclean, then not to be used; if clean, then this descriptive character is used in…”

“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…”

“These birds were provided by the priest for the man. They were not, like the offerings for the altar, brought by the man himself (compare Leviticus 14:4 with Leviticus 14:10), they were not presented nor brought near the sanctuary, nor was any portion of them offered on the altar. Cedar wood, and scarlet, and hyssop - These three substances were used as the common materials in rites of purification (compare Exodus 12:22; Numbers 19:8; Psalms 51:7; Hebrews 9:19): the “cedar”, or juniper, the resin or turpentine of which was a preservative against decay, and employed in medicines for elephantiasis and other skin diseases: the “scarlet”, a “tongue,” or band, of twice-dyed scarlet wool, with…”

“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…”

“14:4 The items listed here were part of the cleansing ritual involving the ashes of the red heifer (Num 19:6), but their exact significance is unknown. See also Heb 9:18-22. Hyssop was a small plant used for sprinkling blood (Exod 12:22) and in purification rites (Num 19:18).”

“two birds: or, sparrows, The word tzippor, from the Arabic zaphara, to fly, is used in the Scriptures to denote birds of every species, particularly small birds. But it is often used in a more restricted sense, as the Hebrew writers assert, to signify the sparrow. Aquinas says the same; and Jerome renders it here the sparrow. So the Greek στρουθια, in Matthew and Luke, which signifies a sparrow, is rendered by the Syriac translator tzipparin, the same as the Hebrew tzipporim. Nor is it peculiar to the Hebrews to give the same name to the sparrow and to fowls of the largest size; for Nicander calls the hen στρουθος κατοικαδος, the domestic sparrow, and both Plautus and Ausonius call the…”