After the Lord rescues his people from Egypt, he sets a statute for Israel to remember their rescue through a celebration meal called the Passover. It was through this celebration that generation after generation would remember the amazing work of their God.
"I will open my mouth in a parable; I will utter dark sayings from of old, things that we have heard and known, that our fathers have told us. We will not hide them from their children, but tell to the coming generation the glorious deeds of the Lord, and his might, and the wonders that he has done." Psalm 78:2-4