'Sabbath day' in the Bible

‘Observe the Sabbath day to keep it holy (set apart, dedicated to God), as the Lord your God commanded you.

You shall remember [with thoughtful concern] 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 by an outstretched arm; therefore the Lord your God has commanded you to observe the Sabbath day.