'Keep the Sabbath' in the Bible

So you must keep the Sabbath, for it is holy for you. Everyone who defiles it must surely be put to death; indeed, if anyone does any work on it, then that person will be cut off from among his people.

The Israelites must keep the Sabbath by observing the Sabbath throughout their generations as a perpetual covenant.

Then I directed the Levites to purify themselves and come and guard the gates in order to keep the Sabbath day holy. For this please remember me, O my God, and have pity on me in keeping with your great love.