What does Deuteronomy 5:15 mean?

Remember, you used to be slaves in Egypt, and the Lord your God brought you out of there with a strong hand and a powerful arm. That's why he told you to set aside this day for rest. Deuteronomy 5:15 - Modern Text Bible

(This verse reminds the people that their freedom is a gift from God, and the Sabbath is a way to honor that rescue and trust in God's care.)