Common misinterpretations frame the slaying of Egypt's firstborn as arbitrary cruelty by a capricious God, overlooking the context of Pharaoh's hardened heart and repeated refusals despite nine prior plagues and warnings, which escalated to this judgment as righteous retribution against oppression. Others erroneously infer endorsement of child sacrifice, ignoring the explicit redemption of Israelite firstborn sons instead of their immolation, or apply it legalistically to demand identical practices today without regard for its role in the Mosaic covenant's historical commemoration of exodus redemption.
Exodus 13:15
King James Version (1769)
15 And it came to pass, when Pharaoh would hardly let us go, that the Lord slew all the firstborn in the land of Egypt, both the firstborn of man, and the firstborn of beast: therefore I sacrifice to the Lord all that openeth the matrix, being males; but all the firstborn of my children I redeem.
This passage reveals the origin of Israel's sacred duty to consecrate all firstborn males—both human and animal—to the Lord, stemming directly from God's tenth plague on Egypt, where He slew the firstborn there to compel Pharaoh's release of the Israelites after persistent defiance. Human firstborn are redeemed rather than sacrificed, while clean animals are offered, serving as a perpetual memorial of divine deliverance, protection of Israel, and substitutionary redemption that foreshadows greater biblical themes of salvation through sacrifice.