Exodus 31:15-17

VIN(i) 15 Six days may work be done, but the seventh day is a Sabbath of complete rest, holy to the Lord; whoever does any work on the Sabbath day is to be put to death. 16 "'The Israelites must observe the Sabbath and celebrate the Sabbath throughout their generations as a long lasting covenant. 17 It is a sign between me and the sons of Israel for ever; for in six days the LORD made the heavens and the earth, and on the seventh day he rested and was refreshed.