Exodus 22:29-30
Here, God tells the Israelites that their firstborn cattle and sheep must be offered to Him on the eighth day of life. Likewise, the firstborn of the Israelite children—or rather the redeeming sacrificial lambs with which the parents bought back their newborn babies from God—must be offered on the babies' eighth day of life. In the case of a boy, this coincides with the day of his circumcision. The baby was "presented" to God at this time, and, although the parents had redeemed the baby, God still claimed the firstborn as being special to Him and still belonging to Him!
Note that the eighth-day presentation and offering were peculiar to the firstborn and was in addition to the sin offering and burnt offering (pigeons, turtledoves, or lambs) that were required for every other newborn baby and for the ritual purification of the mother: "Speak to the children of Israel, saying, 'If a woman has conceived, and borne a male child, then she shall be unclean seven days. . . . And on the eighth day [he] . . . shall be circumcised'" (Leviticus 12:2-3).
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The Law of the Firstborn
