What does Exodus 13:12 mean?
Before giving instructions about the Feast of Unleavened Bread (Exodus 13:3–10), the Lord commanded that all Israel's firstborn be consecrated to Himself (Exodus 13:1–2). The first male born to any woman or animal was considered to belong to God. Redemption was required for people and optional for animals. To "redeem" a firstborn required the sacrifice of a lamb. This would remind Israel of the tremendous value which God placed on them. It would also echo the night of the first Passover where the Lord devastated Egypt's firstborn (Exodus 12:29–30) while sparing faithful Israelites (Exodus 11:7) who trusted in lamb's blood (Exodus 12:12–13).In some rare cases, firstborn were not "redeemed" and kept with the family. A special example is Samuel. His mother, Hannah, dedicated him entirely to God (1 Samuel 1:11). When he was old enough, he went to live and serve with the priests (1 Samuel 1:26–28).