Exodus 20:8–11 Remember to observe the Sabbath day by keeping it holy. You have six days each week for your ordinary work, but the seventh day is a Sabbath day of rest dedicated to the Lord your God. On that day no one in your household may do any work… For in six days the Lord made the heavens, the earth, the sea, and everything in them; but on the seventh day he rested. That is why the Lord blessed the Sabbath day and set it apart as holy.”

“ Rest is the essential enzyme of life, as necessary as air. Without rest, we cannot sustain the energy needed to have life. We refuse to rest at our peril, and yet in a world where overwork is seen as a  virtue, many of us feel we can only be legitimately stopped by illness or collapse… so God gives you this commandment - remember to rest. This is not a lifestyle suggestion, but a commandment as important as not stealing, murdering or lying. Remember to play and bless and love and eat with those  God has given you.”
Sabbath by Wayne Mueller: Page 19 , 32