Exodus 13:11-14

“And when the LORD takes you into the land of the Canaanites, the land he promised to give you and your ancestors, you must give him every firstborn male. Also every firstborn male animal must be given to the LORD. Buy back every firstborn donkey by offering a lamb. But if you don’t want to buy the donkey back, then break its neck. You must buy back from the LORD every firstborn of your sons. “From now on when your son asks you, ‘What does this mean?’ you will answer, ‘With his great power, the LORD brought us out from Egypt, the land where we were slaves.