And when Pharaoh stubbornly refused to let us go, Yahweh killed all the firstborn in the land of Egypt, both the firstborn of man and the firstborn of animal. That is why I sacrifice to Yahweh every male that opens the womb, but all the firstborn of my sons I redeem.’ Bible see other translations

“stubbornly refused.” The Hebrew is qashah (#07185 קָשָׁה), see commentary on Exodus 4:21.

“that opens the womb.” This is an idiom for being the firstborn. The firstborn “opens the womb.”

“but all the firstborn of my sons I redeem.” The firstborn male children could not be offered as sacrifices, so they had to be redeemed—bought back from Yahweh with money. The redemption price is not given in Exodus, but is given in Numbers 18:15-16 as five shekels of silver.

Commentary for: Exodus 13:15