You must buy back every firstborn donkey with a lamb, and if you don't do so, you have to break its neck. You must buy back every firstborn of your sons.
Pharaoh stubbornly refused to let us leave, so the Lord killed every firstborn in the land of Egypt, both human and animal. That's the reason why I sacrifice to the Lord the firstborn male of every animal, and I buy back all the firstborn of my sons.’