rsv Exodus:13:12-15
rsv@Exodus:13:12 @ you shall set apart to the LORD all that first opens the womb. All the firstlings of your cattle that are males shall be the LORD's.
rsv@Exodus:13:13 @ Every firstling of an ass you shall redeem with a lamb, or if you will not redeem it you shall break its neck. Every first-born of man among your sons you shall redeem.
rsv@Exodus:13:14 @ And when in time to come your son asks you, `What does this mean?' you shall say to him, `By strength of hand the LORD brought us out of Egypt, from the house of bondage.
rsv@Exodus:13:15 @ For when Pharaoh stubbornly refused to let us go, the LORD slew all the first-born in the land of Egypt, both the first-born of man and the first-born of cattle. Therefore I sacrifice to the LORD all the males that first open the womb; but all the first-born of my sons I redeem.'