'Keep the Sabbath' in the Bible

Ye shall keep the sabbath therefore: for it is holy to you. Every one that profaneth it shall surely be put to death: for whoever doeth any work therein, that soul shall be cut off from among his people.

Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, for a perpetual covenant.

Keep the sabbath-day to sanctify it, as the LORD thy God hath commanded thee.

And remember that thou wast a servant in the land of Egypt, and that the LORD thy God brought thee out thence with a mighty hand and by an out-stretched arm: therefore the LORD thy God commanded thee to keep the sabbath-day.