Remember that you were a slave in the land of Egypt, and that the LORD your God brought you out of there with a mighty hand and an outstretched arm. That is why the LORD your God has commanded you to keep the Sabbath day.
Jewish Publication Society of America Version (JPS1917) - Deuteronomy 5:15 >And thou shalt remember that thou was a servant in the land of Egypt, and the LORD thy God brought thee out thence by a mighty hand and by an outstretched arm; therefore the LORD thy God commanded thee to keep the sabbath day.