Thematic Bible: Consecration of the firstborn

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. 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. It is to be a sign on your hand and an emblem on your forehead, because the LORD brought us out of Egypt with a strong show of force.'"