IT IS A COMMANDMENT TO REMEMBER THE HISTORICAL EGYPTIAN REDEMPTION

Exodus 13:8 And you shall show your son in that day, saying, This is done because of that which the LORD did unto me when I came forth out of Egypt.

Exodus 13:9 And it shall be for a sign unto you upon thine hand and for a memorial between your eyes that the LORD'S law may be in thy mouth: for with a strong hand has the LORD brought thee out of Egypt.