Thematic Bible: Consecration of the firstborn

"In the future, when your son asks you, 'What does this mean?' say to him, 'By the strength of [His] hand the Lord brought us out of Egypt, out of the place of slavery. When Pharaoh stubbornly refused to let us go, the Lord killed every firstborn [male] in the land of Egypt, from the firstborn of man to the firstborn of livestock. That is why I sacrifice to the Lord all the firstborn of the womb that are males, but I redeem all the firstborn of my sons.' So let it be a sign on your hand and a symbol on your forehead, for the Lord brought us out of Egypt by the strength of His hand."