Exodus 13:9-16

9It shall be a sign for you on your hand and a reminder on your forehead that the Law of the LORD is to be on your lips. For with a mighty hand the LORD brought you out of Egypt. 10Therefore you shall keep this statute at the appointed time year after year.

11And after the LORD brings you into the land of the Canaanites and gives it to you, as He swore to you and your fathers, 12you are to present to the LORD the firstborn male of every womb. All the firstborn males of your livestock belong to the LORD. 13You must redeem every firstborn donkey with a lamb, and if you do not redeem it, you are to break its neck. And every firstborn of your sons you must redeem.

14In the future, when your son asks you, ‘What does this mean?’ you are to tell him, ‘With a mighty hand the LORD brought us out of Egypt, out of the house of slavery. 15And when Pharaoh stubbornly refused to let us go, the LORD killed every firstborn in the land of Egypt, both of man and beast. This is why I sacrifice to the LORD the firstborn male of every womb, but I redeem all the firstborn of my sons.’ 16So it shall serve as a sign on your hand and a symbol on your forehead, for with a mighty hand the LORD brought us out of Egypt.”