Exodus 13:13-15

International Standard Version

¹³ You are to redeem every firstborn donkey^[a] with a lamb, and if you don’t redeem it, you are to break its neck. You are to redeem every firstborn^[b] among your sons. ¹⁴ Then when your child asks you in the future, ‘What is this?’, you are to say to him, ‘The Lord brought us out of Egypt, from the house of bondage with a strong show of force.^{[c] 15} And when Pharaoh stubbornly refused to let us go, the Lord killed every firstborn in the land of Egypt, from the firstborn of humans to the firstborn of animals. Therefore, I sacrifice to the Lord every male that first opens the womb, but I redeem every firstborn of my sons.