Exodus 13:15

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 16:29

16:29 See, because the Lord has given you the Sabbath, that is why he is giving you food for two days on the sixth day. Each of you stay where you are; let no one go out of his place on the seventh day.”

Exodus 18:14

18:14 When Moses’ father-in-law saw all that he was doing for the people, he said, “What is this that you are doing for the people? Why are you sitting by yourself, and all the people stand around you from morning until evening?”