Exodus 31:15–17

15 Work shall be done for tsix days, but the useventh is the Sabbath of rest, holy to the Lord. Whoever does any work on the Sabbath day, he shall surely be put to death. 16 Therefore the children of Israel shall keep the Sabbath, to observe the Sabbath throughout their generations as a perpetual covenant. 17 It is va sign between Me and the children of Israel forever; for win six days the Lord made the heavens and the earth, and on the seventh day He rested and was refreshed.’ ”