Exodus 13:8-9

13:8 You are to tell your son on that day, ‘It is because of what the Lord did for me when I came out of Egypt.’ 13:9 It will be a sign for you on your hand and a memorial on your forehead, so that the law of the Lord may be in your mouth, for with a mighty hand the Lord brought you out of Egypt.

Exodus 13:14-15

13:14 In the future, when your son asks you ‘What is this?’ you are to tell him, ‘With a mighty hand the Lord brought us out from Egypt, from the land of slavery. 13:15 When Pharaoh stubbornly refused to release us, the Lord killed all the firstborn in the land of Egypt, from the firstborn of people to the firstborn of animals. That is why I am sacrificing to the Lord the first male offspring of every womb, but all my firstborn sons I redeem.’

Exodus 13:22

13:22 He did not remove the pillar of cloud by day nor the pillar of fire by night from before the people.