Exodus 13:13-15

Revised Standard Version

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. 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. 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.’