In Deuteronomy 15:19-23 Moses gives the law concerning offering the firstborn of an Israelite’s clean animals to God, emphasizing that the animals used in sacrifice must also be without blemish. This law builds on the theology of the Passover and Exodus where God redeemed His people so as to spare the firstborn of Israel through the blood of a lamb. This law was meant to be a reminder of what it takes to make an atonement whereby the people of God can truly be called His sons. Ultimately, all of this points to Christ’s sacrifice, the true unblemished, firstborn who gave Himself to make atonement for the sins of His people.
Deuteronomy 15:19-23