Exodus 13
Exodus 13 establishes two lasting practices that encode the Exodus into Israel's body and calendar: the consecration of every firstborn and the Feast of Unleavened Bread. Every firstborn male — human and animal — belongs to God, because God spared Israel's firstborn in Egypt. The firstborn animals are sacrificed or redeemed; the firstborn sons are redeemed. This is not arbitrary ritual but embodied theology: the redeemed carry the memory of redemption in the very structure of their family life. The feast of seven days without leaven keeps the urgency of the departure alive each year. Moses takes Joseph's bones with him, fulfilling the oath Joseph made his brothers swear four hundred years earlier — one of Scripture's most quietly faithful acts of covenant memory. God leads the people not by the most direct route but by the wilderness road, knowing they are not yet ready for war. He goes before them in a pillar of cloud by day and fire by night — guidance that is visible, constant, and personal. Deuteronomy 6:20–23 commands parents to explain all this to their children. The rituals exist precisely so that the next generation will ask why.