Exodus 31:16

14You shall keep the Sabbath therefore, for it is holy to you. Everyone who profanes it shall surely be put to death; for whoever does any work therein, that soul shall be cut off from among his people.

15Six days shall work be done, but on the seventh day is a Sabbath of solemn rest, holy to the LORD. Whoever does any work on the Sabbath day shall surely be put to death.

16Therefore the children of Israel shall keep the Sabbath, to observe the Sabbath throughout their generations, for a perpetual covenant.

17It is a sign between me and the children of Israel forever; for in six days the LORD made heaven and earth, and on the seventh day he rested, and was refreshed.’”

18When he finished speaking with him on Mount Sinai, he gave Moses the two tablets of the covenant, stone tablets, written with God’s finger.