Deuteronomy Chapter 5, Verse 15

15: And remember that thou wast a servant in the land of Egypt, and that the LORD thy God brought thee out thence through a mighty hand and by a stretched out arm: therefore the LORD thy God commanded thee to keep the sabbath day.- edit KJV text
15: Remember that thou also didst serve in Egypt, and the Lord thy God brought thee out from thence with a strong hand, and a stretched out arm. Therefore hath he commanded thee that thou shouldst observe the sabbath day.— edit Douay text
15: And thou shalt remember that thou wast a slave in the land of Egypt, and the Lord thy God brought thee out thence with a mighty hand, and a high arm: therefore the Lord appointed thee to keep the sabbath day and to sanctify it.— edit LXX text